Exclude words you don't want. Searching for pig AND cloning NOT sheep will locate pages that contain information about pig cloning, but do not contain the word sheep. Use specialized search engines and subject directories. Besides the major search engines, there are also smaller sites on the Internet that allow you to search in specific subject areas, such as medicine. Guess the address.
Most companies use their name as their URL if possible.
Read the help page. Most search engines have a page similar to this, with information and tips specific to their search engine.