Perhaps you should try some spelling variations:
"synchronize swimming" » "synchronized swimming", "synchronizing swimming", "synchronize stemming"
"synchronize flemming" » "synchronized flemming", "synchronizing flemming", "synchronize fleming"
"synchronism swimming" » "synchronism stemming", "synchronized swimming"
"synchronising swimming" » "synchronising stemming", "synchronizing swimming", "synchronisations swimming"

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