Enter basic queries as a series of single words or phrases, separated by commas. The search will return documents which contain any of those words or any of those phrases. It will score each document according to how many matching words and phrases it contains. For example, if you enter the query...
film, movie, location, sound stage
...documents containing the phrase "sound stage" or the word "location" or the word "film" or the word "movie" will be found. Those dealing with shooting theatrical movies, either on a sound stage or on locaton, will have a high score. Those dealing with other aspects of the film industry will have lower scores. Those dealing with thin layers of oil on roadways are likely to be scored even lower.
Case does not matter--the query above will find documents containing "film", "Film" and "FILM". It will also find words which are stemmed variations: "films" and "filmed" for example.
This is all that you need to know, unless you wish to assemble sophisticated queries. If you do, read on.
Operators can be used to make queries more specific. For example...
film AND movie AND location AND sound stage
...will exclude documents about other aspects of the film industry (and about oil on roadways). But it will have unintended effects as it will also exclude documents about movies filmed entirely on location or entirely on a sound stage. A better query would be...
(movie, film) AND (location, sound stage)
...requiring the word "movie" or the word "film" to be in the same document as the word "location" or the phrase "sound stage".
Operators are case-insensitive: "AND" and "and" are equivalent.
Operators are enclosed by "pointy brackets". Thus, the AND operator is strictly rendered as <AND>. However, three and only three operators are exempt from the "pointy bracket" rule: AND, OR and NOT. These may be bracketed--it is purely optional.