Did you know that you can use wildcards to search your data?  Putting an asterisk behind a word replaces 0 or more characters so that you can find all incidences of the text containing the root word.
If you wanted to find any document that contained the word light and any text containing the word light you can employ the use of the asterisk character.

See how search found every incidence of the word light on this .DWG file.

You can also use a wildcard to exclude words from your search.  If you wanted to find all documents that contain the word conference but not the word table you can employ the use of the minus character.