Perhaps you should try some spelling variations:
"synthesize" » "synthesized", "synthesis", "synthese"
"synthesizes" » "synthesizeds", "synthesiss", "syntheses", "synthesized", "synthesis", "synthesizing"
"syntheses" » "synthesis", "synthese"
"synthesiss" » "synthesises", "synthesis", "synthesise"

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: ("synthesize" OR (("synthesizes" OR "syntheses") OR "synthesiss")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(\"synthesize\" or ((\"synthesizes\" OR \"syntheses\") or \"synthesiss\"))".
• Removing quotes may allow a broader search: ( synthesize or (( synthesizes OR syntheses ) or synthesiss )).
• Adding a wildcard symbol may retrieve word variants: ("synthesize" or (("synthesizes" OR "syntheses") or "synthesiss"))*.