Curious question regarding OR

I’m using DA to search the Devontech forums for anything regarding a CommonPlace Book.

Ex. #1 — I enter the following query: Commonplace

and I get 5 results.

Ex. # 2 — I enter the following query: Commonplace OR “Common Place”

and I get 0 results.

– Why is this? If I enter the query from the 2nd example, shouldn’t it pickup the 5 results? I’m under the impression it will pickup pages with either Commonplace or Common place. Am I screwing up somewhere?

The forum’s support for OR is limited to words (enclosed in parentheses) but doesn’t support phrases.