Perhaps you should try some spelling variations:
"harvard bond tracer studies book series." » "harvard cold tracer studies book series.", "harvard home tracer studies book series.", "harvard bone tracer studies book series.", "harvard bond traders studies book series.", "harvard bond trade studies book series.", "harvard bond tracer studies books series.", "harvard bond tracer studies ebook series."
"harvard id case studies from survey." » "harvard id case studies firm survey.", "harvard u case studies from survey.", "harvard cold 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 tracer studies book series."))~.
• Removing quotes may allow a broader search: (( harvard id case studies from survey. ) or ( harvard bond tracer studies book series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("harvard id case studies from survey.") or ("harvard bond tracer studies book series."))*.