Perhaps you should try some spelling variations:
wang sang » wang yang, wang liang, wang yan
congo can » congo call, cong van, congo a
sang minh » kang minah, anh minh, song min
bank run » bank runs
how slow » how low, how slower, grow slow
yan kun » yan guan, yan yuan
how so » how some

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

• Performing a fuzzy search may retrieve terms with similar spellings: congo can ((bank run) or (yan kun)) wang sang minh ((how so) or (how slow)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: congo can ((bank run) OR (yan kun)) wang sang minh ((how so) OR (how slow)) ;.
• Adding a wildcard symbol may retrieve word variants: congo can ((bank run) or (yan kun)) wang sang minh ((how so) or (how slow)) ;*.