To find relevant business opportunities, start with narrowing down your search. Write anything from a few keywords to a couple of sentences depending on the complexity of what you are looking for.
The general idea is to write enough to describe your focus but not anything more than the essentials. If you don't add enough information, all your requirements will not be taken into consideration. On the other hand, if you add too much, you might end up with too generic search results including a little of everything.