Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronism swimming", "synchronize swimming"
"synchronised stemming" » "synchronism stemming", "synchronize stemming"
"synchronised stepping" » "synchronism stepping", "synchronize stepping"
"synchronising stepping" » "synchronizing stepping", "synchronism stepping", "synchronisations stepping"
"synchronising steering" » "synchronizing steering", "synchronism steering", "synchronisations steering"
"synchronising stopping" » "synchronizing stopping", "synchronism stopping", "synchronisations stopping"
"synchronized flemming" » "synchronized fleming"

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