Apple Trees (German: Apfelbäume ) is a 1992 German drama film directed by Helma Sanders-Brahms.
 It was screened in the Un Certain Regard section at the 1992 Cannes Film Festival.
Germany, Pale Mother (German: Deutschland bleiche Mutter ) is a 1980 West German drama film written and directed by Helma Sanders-Brahms.
 It was shown at the 30th Berlin International Film Festival in 1980, where it was nominated for a Golden Bear award.
 It was not released in the United States until 1984.
From Vegas to Macau III (賭城風雲III) is a 2016 Hong Kong-Chinese action comedy film directed by Andrew Lau and Wong Jing and starring Chow Yun-fat, Andy Lau, Nick Cheung and Li Yuchun, with special appearances by Jacky Cheung and Carina Lau.
 The film is the third and final installment of the "From Vegas to Macau" series.
 The film was released on 6 February 2016 in Hong Kong and on 8 February 2016 in China.
Geliebte Clara ("Beloved Clara") is a Franco-German-Hungarian 2008 film, directed by Helma Sanders-Brahms, her last film before her 2014 death, about the pianist Clara Schumann and her marriage with the composer Robert Schumann.
New German Cinema (German: "Neuer Deutscher Film" ) is a period in German cinema which lasted from the late 1960s into the 1980s.
 It saw the emergence of a new generation of directors.
 Working with low budgets, and influenced by the French New Wave, such directors as Rainer Werner Fassbinder, Werner Herzog, Alexander Kluge, Harun Farocki, Volker Schlöndorff, Helma Sanders-Brahms, Hans-Jürgen Syberberg, Margarethe von Trotta and Wim Wenders made names for themselves and produced a number of 'small' motion pictures that caught the attention of art house audiences, and enabled these directors (particularly Wenders and Schlöndorff) to create better-financed productions which were backed by the big US studios.
 However, most of the films were commercial failures and, by 1977, 80% of a budget for a typical German film was ensured by a subsidy.
Helma Sanders-Brahms (20 November 1940 – 27 May 2014) was a German film director, screenwriter and producer.
The Duel is a 2000 Hong Kong "wuxia" comedy film directed by Andrew Lau and starring Andy Lau, Ekin Cheng, Nick Cheung, Kristy Yang, Zhao Wei and Patrick Tam.
 The film is adapted from "Juezhan Qianhou" of Gu Long's "Lu Xiaofeng" novel series.
 It is known for its humorous take on the original story and its special effects.
Infernal Affairs is a series of three crime-thriller films directed by Andrew Lau and Alan Mak, starring Andy Lau and Tony Leung.
 It tells the story of a police officer who infiltrates the triads, and a police officer secretly working for the same gang.
 The Chinese title means "the non-stop way", a reference to Avici, the lowest level of hell in Buddhism.
 The English title is a word play combining the law enforcement term "internal affairs" with the adjective 'infernal'.
Andrew Lau Wai-Keung (born 4 April 1960) is a Hong Kong film director, producer, and cinematographer.
 Lau began his career in the 1980s and 1990s, serving as a cinematographer to filmmakers such as Ringo Lam, Wong Jing and Wong Kar-wai.
 In the 1990s, Lau decided to have more creative freedom as a cinematographer by becoming a film director and producer.
 Apart from making films in his native Hong Kong, Lau has also made films in China, Korea and the United States.
 A highly prolific filmmaker, Lau has made films in a variety of genres, and is most notable in the West for his action and crime films which include the "Young and Dangerous" film series, the "Infernal Affairs" trilogy (the latter co-directed together with Alan Mak), and "Revenge of the Green Dragons" (executive produced by Martin Scorsese).
Laputa is a 1986 West German drama film directed by Helma Sanders-Brahms.
 It was screened in the Un Certain Regard section at the 1986 Cannes Film Festival.

Question: what does Helma Sanders-Brahms and Andrew Lau have in common?
Answer: director