Perhaps you should try some spelling variations:
tested using » test using, testing using, system using
tests using » test using, sets using, results using
a housing » 4 housing
yao yang » yang yang
yang api » yang dali, yang di, yang jui
nan kong » tan kong
kong eiu » tonga eiu
wan yao » wang yan, yang yao, gang yao

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: wan yao yang api ((a housing) OR (((tests using) OR (tested using)))) nan kong eiu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan yao yang api ((a housing) or (((tests using) OR (tested using)))) nan kong eiu ;~".
• Adding a wildcard symbol may retrieve word variants: wan yao yang api ((a housing) or (((tests using) OR (tested using)))) nan kong eiu ;*.