Perhaps you should try some spelling variations:
"harvard world bank study book series." » "harvard cold bank study book series.", "harvard world bank studies book series."
"harvard good bad studies from surveys." » "harvard cold bad studies from surveys.", "harvard home bad studies from surveys.", "harvard good bad studies from survey.", "harvard good bad studies firm surveys.", "harvard good bad studies force surveys.", "harvard good based studies from surveys.", "harvard good eadi studies from surveys.", "harvard good oecd studies from surveys."

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