Perhaps you should try some spelling variations:
"diplomatisch" » "diplomatische", "diplomatischen", "diplomatischer", "diplomacytisch", "diplomatstisch"
"diploma" » "diplomacy", "diplomats"
"diplomacia" » "diplomacycia", "diplomatscia", "diplomacy", "diplomatic", "diplomatie"

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: (("diplomatisch" OR ("diploma" OR "diplom")) OR "diplomacia").
• Removing quotes may allow a broader search: (( diplomatisch or ( diploma or diplom )) or diplomacia ).
• Adding a wildcard symbol may retrieve word variants: (("diplomatisch" or ("diploma" or "diplom")) or "diplomacia")*.