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

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