Phrase searching in PubMed

With Google possibly looking to index book content from a central database [via Erik Benson], it would be nice if they could lend a hand to the NCBI and sort out PubMed's search facilities. Not being able to do phrase searches (eg "injuries caused by excessive exercise" which just gets split up into separate words) is a fundamentally missing part of this search engine, while being a feature that Google manages really well.