Perhaps you should try some spelling variations:
"harvard world bank studies force surveys." » "harvard world bank studies formal surveys.", "harvard world bank studies from surveys.", "harvard world bank studies food surveys.", "harvard world bank studies force survey.", "harvard world bank studies firm surveys.", "harvard world urban studies force surveys."
"harvard cold bank study from services." » "harvard cold bank study from service.", "harvard cold bank study m services.", "harvard cold bank studies from services.", "harvard bond bank study from services.", "harvard good bank study from services.", "harvard food bank study from services."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("harvard world bank studies force surveys.") or ("harvard cold bank study from services."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("harvard world bank studies force surveys.") OR ("harvard cold bank study from services.")).
• Removing quotes may allow a broader search: (( harvard world bank studies force surveys. ) or ( harvard cold bank study from services. )).
• Adding a wildcard symbol may retrieve word variants: (("harvard world bank studies force surveys.") or ("harvard cold bank study from services."))*.