Perhaps you should try some spelling variations:
studies food » studies from, studies led
food surveys » from surveys, force surveys, field surveys
cold bank » world bank, bond bank, food bank
good bank » blood bank, good bad, bond bank
land bank » land banks
bad bank » bad banks, bond bank, a bank

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

• Performing a fuzzy search may retrieve terms with similar spellings: harvard ((cold bank) or (((((good bank) or (bad bank))) or (land bank)))) studies food surveys.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: harvard ((cold bank) OR (((((good bank) OR (bad bank))) OR (land bank)))) studies food surveys..
• Adding a wildcard symbol may retrieve word variants: harvard ((cold bank) or (((((good bank) or (bad bank))) or (land bank)))) studies food surveys.*.