If you wish to find a document that must contain two or more keywords, list the words separated by spaces and select the Boolean "and". If you are looking for any and all occurrances of words relating to a subject (like "footwear boots shoes"), again separate the words with spaces and select the Boolean "or". If you are looking for a phrase like "3rd New York", I'm afraid you will just have to get lucky. Apparently this doesn't support phrases- but I'm working on it. Quotes don't help.