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