Perhaps you should try some spelling variations:
"solid state physics literature gender" » "solid state physik literatur gender", "solid state basics literature gender", "solid state politics literature gender", "solid state physics literature index", "solid state physics literature modern", "solid state physics literature german"
"solid space physics literature general" » "solid space physik literatur general", "solid space basics literature general", "solid space politics literature general", "solid spaces physics literature general", "void space physics literature general", "solid face physics literature general"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("solid state physics literature gender") OR ("solid space physics literature general")).
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