TIP:
Use + and - before your keywords to match only pages with (or without) the words in them.

For example:
"+cat -dog" will match all the pages with "cat" and without "dog". You can require an entire phrase by putting it in quotation marks: "the cat" To require or prevent pages with phrases, put the +/- inside or outside the quotation marks: i.e. +"the cat" or "+the cat" or -'the dog' or "-the dog"