My biggest frustration with GMG: Search never finds what I am looking for. Plus the "extreme business message" at 7AM in europe, i.e. 1 AM on the east coast. Come on, "you must be joking Mr. GMG" !!
I don't know how you are using search, so I won't say you aren't using it right. I will tell you what works well for me.
I never search from the main page. If I am looking for information on Mozart generally, I go to the 'Composers' section and search from within that 'room'. Or if I am looking for 'Mozart symphonies' I go to the 'Great Recordings' section and search from within it. This always produces good results for me. If 'Mozart Symphonies' in the Great Recordings room doesn't find what I want, then I go to, perhaps, General Music Discussion and do the same search there.
If you are already doing it this way, my apologies; I haven't any idea why it makes you trouble...