Perhaps you should try some spelling variations:
material foundation » material foundations, material formation, moral foundation
material function » material functions, arterial function, atrial function
john commons » john comyns, john simmons, john cotton

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

• If you are trying to use Boolean operators, they must be ALL CAPS: john commons guggenheim ((material foundation) OR (material function)).
• Adding a wildcard symbol may retrieve word variants: john commons guggenheim ((material foundation) or (material function))*.