Perhaps you should try some spelling variations:
"synthesizer" » "synthesized", "synthesize", "synthesizes"
"syntheseort" » "syntheseroute", "synthesenetz", "synthesezeit", "synthesisort"
"synthesisdr" » "synthesiser", "synthesisers", "synthesis"
"synthese" » "synthesis"

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