Perhaps you should try some spelling variations:
"harvard world bank history textbook series." » "harvard world bank history textbooks series.", "harvard world bank history book series.", "harvard world bank history text series.", "harvard world banks history textbook series.", "harvard world lanka history textbook series.", "harvard world banking history textbook series."
"harvard cold urban studies from surveys." » "harvard cold urban studies from survey.", "harvard cold urban studies firm surveys.", "harvard cold urban studies force surveys.", "harvard clld urban studies from surveys.", "harvard world urban studies from surveys.", "harvard good urban studies from 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 cold urban studies from surveys.") OR ("harvard world bank history textbook series."))~.
• Removing quotes may allow a broader search: (( harvard cold urban studies from surveys. ) or ( harvard world bank history textbook series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard cold urban studies from surveys.") or ("harvard world bank history textbook series."))*.