can't use pubmed

hi *

i'm using pybliographer on a debian/linux all seems to be ok but:

today i was searching: "mea recording" and pybliographer returned me 0 
results ... as i was not so sure i open firefox 
http://www.ncbi.nlm.nih.gov/entrez/
and type again "mea recording" and i obtain a lot of results.

I don't understand where the problem is, if i put other things like 
"neurons" 0 results but "cellular migration" gives me 10 results

i can't really understand

thanks
paolo



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