Perhaps you should try some spelling variations:
gang sung » gang und, gang gong, hung sung
yan guan » gan guan, yan yuan, yang guang
gui guan » gan guan, gui hua, tuo guan
sung sin » sung sisi, dong sin, sung un
wai yan » wang yan, wei yang
dong di » dong sin
yi gang » ii gang, i gang, li gang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wai yan) or (dong di)) ((yan guan) or (gui guan)) ming yi gang sung sin ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wai yan) OR (dong di)) ((yan guan) OR (gui guan)) ming yi gang sung sin ;*.