Perhaps you should try some spelling variations:
"harvard world case studies from series." » "harvard cold case studies from series.", "harvard world case studies rom series.", "harvard world case studies from services.", "harvard world case studies forum series.", "harvard world class studies from series."
"harvard world bank studies food surveys." » "harvard cold bank studies food surveys.", "harvard world urban studies food surveys.", "harvard world bank study food surveys.", "harvard world bank students food surveys.", "harvard world bank studies field surveys.", "harvard world bank studying food surveys.", "harvard world bank studies from surveys.", "harvard world bank studies force surveys."

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: (("harvard world case studies from series.") OR ("harvard world bank studies food surveys."))~.
• Removing quotes may allow a broader search: (( harvard world case studies from series. ) or ( harvard world bank studies food surveys. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard world case studies from series.") or ("harvard world bank studies food surveys."))*.