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 food based studies from series." » "harvard food case studies from series.", "harvard cold based studies from series.", "forward food based studies from series.", "harvard home based studies from series.", "harvard food based studies rom series.", "harvard food based studies from services.", "harvard food based studies forum series.", "harvard wood based studies from series.", "harvard food basket studies from series.", "harvard food baskets studies from series."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("harvard world bank study book series.") or ("harvard food based studies from series."))~.
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• Adding a wildcard symbol may retrieve word variants: (("harvard world bank study book series.") or ("harvard food based studies from series."))*.