When ever I perform a search the results I get are toooo ambiguous.

Search1: "OR versus DP" in subject.
Results: All the posts that contain "or" or "dp". You can imagine the w'or'ds that contain "or".

Search2: "OR+versus+DP" in subject.
Results2: No matches.

Search3: "OR+versus+DP" in subject and body.
Results3: No matches.

And I do not want to search with "OR versus DP" in subject and body. Can't imagine the results.

Is my search criteria is wrong?