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

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

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