Perhaps you should try some spelling variations:
"synchronize swimming" » "synchronizing swimming"
"synchronized swimming" » "synchronizingd swimming"
"synchronising swimming" » "synchronizing swimming", "synchronisations swimming"
"synchronised stemming" » "synchronised streaming", "synchronised steering", "synchronised flemming"

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