Perhaps you should try some spelling variations:
"synchronize swimming" » "synchronized swimming", "synchronism swimming"
"synchronize stemming" » "synchronized stemming", "synchronism stemming", "synchronize streaming", "synchronize steering", "synchronize stepping"
"synchronize flemming" » "synchronized flemming", "synchronism flemming", "synchronize fleming"
"synchronizing stemming" » "synchronizing streaming", "synchronizing steering", "synchronizing stepping", "synchronized stemming"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("synchronize swimming") or ((((("synchronize stemming") OR ("synchronizing stemming"))) or ("synchronize flemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronize swimming") OR ((((("synchronize stemming") OR ("synchronizing stemming"))) OR ("synchronize flemming")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronize swimming\") or (((((\"synchronize stemming\") OR (\"synchronizing stemming\"))) or (\"synchronize flemming\"))))".
• Removing quotes may allow a broader search: (( synchronize swimming ) or ((((( synchronize stemming ) OR ( synchronizing stemming ))) or ( synchronize flemming )))).
• Adding a wildcard symbol may retrieve word variants: (("synchronize swimming") or ((((("synchronize stemming") OR ("synchronizing stemming"))) or ("synchronize flemming"))))*.