Perhaps you should try some spelling variations:
based studies » case studies
studies force » studies formal, studies food
force surveys » force survey, firm surveys
harvard good » harvard cold, harvard home
harvard bond » harvard cold, harvard home
rate studies » race studies, trade studies, state studies
from surveys » from survey, firm surveys
good based » wood based, food based, good bad

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( harvard good based studies force surveys. ) or ( harvard bond rate studies from surveys. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( harvard good based studies force surveys. ) OR ( harvard bond rate studies from surveys. ))*.