Perhaps you should try some spelling variations:
"synthesizer" » "synthesized", "synthesizes", "synthesizing", "synthesizedr", "synthesisr", "syntheser"
"synthesisdr" » "synthesiser", "synthesisers", "synthesis"
"synthesize" » "synthesized", "synthesis", "synthese"

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: (("synthesizer" OR "synthesisdr") OR "synthesize").
• Removing quotes may allow a broader search: (( synthesizer or synthesisdr ) or synthesize ).
• Adding a wildcard symbol may retrieve word variants: (("synthesizer" or "synthesisdr") or "synthesize")*.