Perhaps you should try some spelling variations:
cua truong » cua trung, xuan truong, cac truong
bien tinh » bi tinh, yen tinh, diep tinh
hang hang » nang hang, cang thang, hung thang
xa truong » cac truong
cong tac » cong ty
toan cao » toan ban, toan tap
so bien » mot bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: so bien tinh - hang hang ((cua truong) or (xa truong)) ((cong san) or (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so bien tinh - hang hang ((cua truong) OR (xa truong)) ((cong san) OR (cong tac)) toan cao.
• Adding a wildcard symbol may retrieve word variants: so bien tinh - hang hang ((cua truong) or (xa truong)) ((cong san) or (cong tac)) toan cao*.