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

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

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