Perhaps you should try some spelling variations:
knowing about » known about, know about, knowing your
test using » tests using, tested using, testing using
kong saur » kong sar, kong siu, kong your
lang dan » liang dan, wang dan, lang lang
dan yang » daun yang, tan yang, wang yang
kong eiu » tonga eiu
yang xi » yang di, yang yi, yang jui
xi test » ai test, i test, ii test
using a » using _

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

• Performing a fuzzy search may retrieve terms with similar spellings: lang dan yang xi test using a ((((kong saur) or (knowing about))) or (kong eiu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang dan yang xi test using a ((((kong saur) OR (knowing about))) OR (kong eiu)) ;.
• Adding a wildcard symbol may retrieve word variants: lang dan yang xi test using a ((((kong saur) or (knowing about))) or (kong eiu)) ;*.