Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
song john » kong john, strong john, longo john
wong john » wrong john, kong john, longo john
yi chang » ii chang, ying chang, jin chang
api test » ai test, i test, ii test
test 4 » test _
4 kim » _ kim, b kim, c kim

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: wang ((wang yang) OR (yi chang)) api test 4 kim ((song john) OR (wong john)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((wang yang) or (yi chang)) api test 4 kim ((song john) OR (wong john)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((wang yang) or (yi chang)) api test 4 kim ((song john) OR (wong john)) ;*.