Perhaps you should try some spelling variations:
era housing » a housing, rural housing, core housing
test using » tests using, tested using, testing using
yan yang » yang yang, yao yang, dan yang
yang api » yang dali, yang di, yang jui
nan kong » tan kong
kong eiu » tonga eiu
wai yan » wang yan, wei yang

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 yang api ((era housing) or (test using)) nan kong eiu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wai yan yang api ((era housing) OR (test using)) nan kong eiu ;*.