Perhaps you should try some spelling variations:
"synthesizer" » "synthesized", "synthesizes", "synthesizing", "synthesizedr", "synthesisr", "syntheser"
"synthesenetz" » "synthesen", "synthesewege", "syntheseort"
"synthesiser" » "synthesisers", "synthesises", "synthesised"
"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 ("synthesenetz" OR "synthesiser")) OR "synthesize").
• Removing quotes may allow a broader search: (( synthesizer or ( synthesenetz or synthesiser )) or synthesize ).
• Adding a wildcard symbol may retrieve word variants: (("synthesizer" or ("synthesenetz" or "synthesiser")) or "synthesize")*.