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".