Perhaps you should try some spelling variations:
yan zhang » yuan chang, bin zhang, han chang
wang yang » wang yan, wang liang, wang yanling
yang gang » yang guang, yang yang, eoyang gang
gang sung » gang und, gang gong, hung sung
run wang » yuan wang, run wage, von wang
sung min » song min, kyung min, sang minh
yan han » man han, kang han, yan clan

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yan han) or (yan zhang)) run wang yang gang sung min ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yan han) OR (yan zhang)) run wang yang gang sung min ;*.