How do maximise full text search on Endnote?

Hi

I have just started using ‘fulltext’ function on Endnote X2. Whilst useful, the percentage of article retrival is pretty low, I am at an acadmic institution where we have access to a lot of journals so one would expect it to me higher. Has anyone got a suggestion of how to maximise the Full text search?

Cheers and Thanks

Bluefish