1.  "  " Quotations around a word or phrase will call for an exact match.
     Example: "word"
2.  + and - qualifiers
     If you pre pen a word with + that word is required to be on the page.
     If you pre pen a word with - that word is required to not be on the page.
     Example:  +always -never  (+ or - symbols are used in phrase word searches)
 3.  * wild card
     If a query word ends with a * all words on a page which begin with the query word 
     will match.  Example:  gift*
     If a query word begins with a * all words on a page which end the with the query
     word will match.  Example:  *gift
 4.  ? wild card
     If a query word contains a ? any character will match that position.
     Example: b?g  (may find words like:  bug, bag, big) etc.
5.   Any of the above techniques can be combined.
     Example:   +alway* -ne??r*
6.  Spelling and Capitalized words may also make a difference.