and
the answer to this question #19 is AND
"http://wiki.answers.com/Q/Which_Boolean_operator_limits_your_search_so_that_each_term_you_input_must_be_in_the_same_document" is it: or, not,and,also
The answer is "and"
and
It would depend on the system, but probably "AND". For example, a query '"used" AND "cars"' should return only documents containing both terms. Sometimes the AND operator is represented symbolically, such as "used" && "cars". Again, it depends on the context.
+|plus
The answer will increase in numbers.
The answer will increase in numbers.
BUT (apex)
All of them can limit your search. Here are the meanings of all of them: AND: Find results that only contain both words OR: Find results that contain either (or both) words NOT: Do not find results that contain a word XOR: Find results that contain either (but not both) words
A keyword search searches for exact word when a boolean search looks for synonym's. The difference between a keyword search and a boolean search is the focus of the search. A keyword search is a search for an exact word. A boolean search is a search for a synonym.