Perhaps you should try some spelling variations:
"harvard world bank studies book series." » "harvard cold bank studies book series.", "harvard world urban studies book series.", "harvard world bank studies books series.", "harvard world bank studies ebook series."
"harvard food bank study from sources." » "harvard cold bank study from sources.", "forward food bank study from sources.", "harvard home bank study from sources.", "harvard food bank studies from sources.", "harvard good bank study from sources.", "harvard blood bank study from sources.", "harvard good banks study from sources."

Try widening your search to All Fields.

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

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