Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronism swimming"
"synchronised stemming" » "synchronized stemming", "synchronism stemming", "synchronised steering", "synchronised stepping", "synchronised stealing"
"synchronised flemming" » "synchronized flemming", "synchronism flemming", "synchronised fleming"
"synchronising swimming" » "synchronizing swimming", "synchronism swimming", "synchronisations swimming"
"synchronize streaming" » "synchronized streaming", "synchronism streaming", "synchronizing streaming", "synchronize 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 ((((("synchronised stemming") OR ("synchronised flemming"))) or ("synchronize streaming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ("synchronising swimming"))) OR ((((("synchronised stemming") OR ("synchronised flemming"))) OR ("synchronize streaming")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") or (\"synchronising swimming\"))) or (((((\"synchronised stemming\") OR (\"synchronised flemming\"))) or (\"synchronize streaming\"))))".
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ( synchronising swimming ))) or ((((( synchronised stemming ) OR ( synchronised flemming ))) or ( synchronize streaming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ("synchronising swimming"))) or ((((("synchronised stemming") OR ("synchronised flemming"))) or ("synchronize streaming"))))*.