Perhaps you should try some spelling variations:
"solid samples physical" » "solid examples physical", "solid simplest physical", "solid samples physics"
"solid simple physical" » "solid complex physical", "solid simple chemical", "solids simple physical", "solid sample physical", "solving simple physical"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"solid simple physical\") OR (\"solid samples physical\"))".
• Removing quotes may allow a broader search: (( solid simple physical ) OR ( solid samples physical )).
• Adding a wildcard symbol may retrieve word variants: (("solid simple physical") OR ("solid samples physical"))*.