Find documents having flat tax plans in the title and which were written by Steve Forbes . Proximity operators come in several forms that can be sensitive or insensitive to argument ordering. The LESS THAN part can be a bit tricky to understand if you don't know how distance is calculated. The window size is based on the number of words, including stopwords, that it contains. They allow the searches constrained to certain textual components such as passages or paragraphs.
Phrases are a bit complex.
However, if all the components of the operation are not met, it may return sub-components or even individual components in a ranked order. As long as a query avoids asking a proximity operator to try to do something with an operator that returns a belief list, a legal query will result. The second query will fail as it is illegal. Although the actual value of the ranking score will not really be meaningful to you, pay attention to the ranking scores with respect to one another.