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

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: "john simmons guggenheim ((material foundation) OR (material function))".
• Adding a wildcard symbol may retrieve word variants: john simmons guggenheim ((material foundation) OR (material function))*.