Perhaps you should try some spelling variations:
"diplomtic" » "diplomatic", "diplomatica", "diplomatico"
"diploma" » "diplom", "diplomacy"
"diplomats" » "diplomts", "diplomacyts", "diplomatic", "diplomacy"
"diplomatics" » "diplomtics", "diplomacytics", "diplomatic", "diplomatie", "diplomatische"

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