For best results:

Capitalization is irrelevant
Searches are not case sensitive. It doesn't matter if you type trustee or Trustee.

You don't need to enter AND
The search engine returns only results that include all your search terms. That means you don't need to type AND between words. So you don't need to type periodontal AND surgery, just periodontal surgery.

Use OR to find pages containing one of two or more words.
For example, you could type Pension OR Benefits to get pages that contain either or both words.

To make this work, you must capitalize the OR

Exclude words by using the minus (-) sign
You can exclude a word from your search by typing - immediately before the word. For example, if you wanted pages about the disability but not long term disability you could type: disability - long term.

Use quotation marks to find a complete phrase
You can search for a complete phrase by enclosing it in quotation marks. For example, the phrase "spouse and children" or "CPP/OAS rates" would return pages that include the entire phrase, not just those individual words.

Very common words will be ignored.
The search engine ignores words such as: where, to, how, with and be, because those words appear on many pages, so searching for them will slow down your results. If those words are important, you can force the search engine to look for them by putting a + sign in front of the word, or by enclosing the entire phrase in quotation marks.

Don't use stemming ("wildcard" searches)
The search engine searches for exactly the word or words you type. So if you type dent OR dent*, you will not get results for either dental OR dentures. If you want results for both, just type both words into the box.