Perhaps you should try some spelling variations:
agent theorie » agency theorie, agent theory
get theorie » meta theorie, set theories, zeit theorie
dong ping » dong sin, dong bin, dong jung
wird tan » wird man, wird das, wing tan
kim jong » kim song, kim dong, kim jang
jong hui » tong hui, gong hui, tong shui
wang » wing, wan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((wang or lang) yan) or (dong ping)) ((get theorie) OR (agent theorie)) wird tan kim jong hui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((wang OR lang) yan) OR (dong ping)) ((get theorie) OR (agent theorie)) wird tan kim jong hui ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((wang or lang) yan) or (dong ping)) ((get theorie) OR (agent theorie)) wird tan kim jong hui ;*".