Perhaps you should try some spelling variations:
"central media research field theories." » "central medical research field theories.", "central iea research field theories.", "central media research field theory.", "central india research field theories.", "central america research field theories."
"central body research final series." » "central body research finance series.", "central body research funds series.", "central body research china series.", "central baby research final series.", "central buy research final series.", "central bodied research final series.", "central bank research final series.", "central city research final series.", "central de research final series.", "central body research finite series.", "central body research financial series."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("central media research field theories.") or ("central body research final series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("central media research field theories.") OR ("central body research final series.")).
• Removing quotes may allow a broader search: (( central media research field theories. ) or ( central body research final series. )).
• Adding a wildcard symbol may retrieve word variants: (("central media research field theories.") or ("central body research final series."))*.