Perhaps you should try some spelling variations:
davis test » davis best, david west, davis tsu
housing a » housing _, housing bank
dong sign » dong sin, among sign, dong bin
wang dan » wang yan, wang ban, wang yidan
dan yang » daun yang, tan yang, wang yang
kong siu » kong eiu, wong siu, dong sin
ai test » api test, i test, ii test

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang dan yang ((davis test) or (ai test)) housing a ((kong siu) or (dong sign)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang dan yang ((davis test) OR (ai test)) housing a ((kong siu) OR (dong sign)) ;.
• Adding a wildcard symbol may retrieve word variants: wang dan yang ((davis test) or (ai test)) housing a ((kong siu) or (dong sign)) ;*.