Enter one or more words - for example "environmental hazards". The found pages are listed according to best fit with the word or words you enter. First the engine tries to locate pages which have exact matches for all of the words entered in your search query. If that fails, it then tries to locate pages which contain any words in your search query.

Tips:

"+" before search word = required on the page
"-" before search word = this word should not be on the page

Here is a link to more search tips.