Perhaps you should try some spelling variations:
"harvard bond rate studies book series." » "harvard bond tracer studies book series.", "harvard bond cases studies book series.", "harvard bond graduate studies book series.", "harvard bank rate studies book series."
"harvard id case studies from survey." » "harvard id case studies firm survey.", "harvard id case studies force survey.", "harvard id case studies firm surveys.", "harvard aids case studies from survey."

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 id case studies from survey.") OR ("harvard bond rate studies book series."))~.
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• Adding a wildcard symbol may retrieve word variants: (("harvard id case studies from survey.") or ("harvard bond rate studies book series."))*.