Perhaps you should try some spelling variations:
"diplomatie" » "diplomatic", "diplomtie", "diplomacytie"
"diploma" » "diplom", "diplomacy"
"diplomats" » "diplomts", "diplomacyts", "diplomatic", "diplomacy"
"diplomatische" » "diplomtische", "diplomacytische", "diplomatischen", "diplomatic"

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: (("diplomatie" OR "diploma") OR ("diplomats" OR "diplomatische")).
• Removing quotes may allow a broader search: (( diplomatie or diploma ) or ( diplomats or diplomatische )).
• Adding a wildcard symbol may retrieve word variants: (("diplomatie" or "diploma") or ("diplomats" or "diplomatische"))*.