I'm not an expert on the search engine, but try this:

Toward the bottom of the search page there is a line that reads -
Return Top 500 results that match all words minimum rank: 0 /1000

Where is says all words there is a drop down list. Click the down arrow and select the exact phrase. Here is a link to my search
http://www.rcuniverse.com/forum/sear...mitbutton=+OK+

For the large threads, instead of scrolling through the pages looking for the highlighted phrase you have in the search you can go to the bottom of the page and enter rolling harrier in the SEARCH THIS THREAD block and it will give you links to the posts within that thread that contain rolling harrier. There is also a block to search RCU using Google.

Here is a link to the Google search
http://www.google.com/custom?domains...rier&sa=Search