Perhaps you should try some spelling variations:
"synthesizer" » "synthesized", "synthesizes", "synthesizing", "synthesizedr", "synthesisr", "syntheser"
"syntheser" » "synthese", "syntheses", "synthesen"
"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 "syntheser") OR "synthesisdr") OR "synthesize").
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((\"synthesizer\" OR \"syntheser\") or \"synthesisdr\") or \"synthesize\")".
• Removing quotes may allow a broader search: ((( synthesizer OR syntheser ) or synthesisdr ) or synthesize ).
• Adding a wildcard symbol may retrieve word variants: ((("synthesizer" OR "syntheser") or "synthesisdr") or "synthesize")*.