postgresql doc search

The postgresql documentation search could be improved by returning results for actual SQL commands. For example,
searchingfor the new "DO" command results in no hits in the 9.0 docs- I guess it's too short or a stop word- pretty
weak. 

Also, after searching the documentation, I may wish to adjust my search, but the search box above the doc search
resultsactually searches the whole postgresql.org website with no option to just search the docs I was just browsing-
ifI do search, then I often get results for the same doc page from a half-dozen old versions of postgresql. I would
preferto only view results from one version or specific versions which one could hopefully select. 

Cheers,
M