Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronize swimming", "synchronising swimming"
"synchronised stemming" » "synchronize stemming", "synchronising stemming", "synchronised steering", "synchronised stepping", "synchronised stealing"
"synchronised streaming" » "synchronize streaming", "synchronising streaming", "synchronised treating"
"synchronized stemming" » "synchronized steering", "synchronized stepping", "synchronized stealing"
"synchronism stemming" » "synchronism steering", "synchronism stepping", "synchronism stealing", "synchronize stemming", "synchronising stemming"
"synchronism flemming" » "synchronize flemming", "synchronising flemming", "synchronism fleming"

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

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