Perhaps you should try some spelling variations:
clark did » clark und, clarke david
yang yang » wang yang
yang jin » yang jie, yang jun, ying jin
yu cheng » yu chen, _ cheng
ping yu » ming yu, ping ku, ping yi
von seo » von see, von seu, von sekr
von sex » von see, von seu, von sekr

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: ((yang jin) OR (((yang yang) OR (wang yan)))) ping yu cheng clark did ((von seo) OR (von sex)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yang jin) or (((yang yang) or (wang yan)))) ping yu cheng clark did ((von seo) OR (von sex)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((yang jin) or (((yang yang) or (wang yan)))) ping yu cheng clark did ((von seo) OR (von sex)) ;*.