Search for phrases like so: "bridge software" using the doublequotes around the phrase. This will search for the exact phrase you specifiy.
This search supports the following boolean operators: AND, OR, AND NOT. Some
-- john AND jane
-- john OR jane
-- john AND NOT jane
You can also search for terms near other terms: "software near bridges" which is sort of a fuzzy phrase search.
Sometimes a search won't return any results if all it contains are ignored words. Examples of ignored words are with, my, I, some, the, at, etc