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

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

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