Perhaps you should try some spelling variations:
hung thang » cang thang, hung tran
bien tinh » bi tinh, yen tinh, diep tinh
hanh hang » thanh hang, hang hang, hanh han
cua khong » hua khong, cua phuong, cua thuong
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban
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 - ((hanh hang) or (hung thang)) cua khong ((cong tan) or (huong dan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so bien tinh - ((hanh hang) OR (hung thang)) cua khong ((cong tan) OR (huong dan)) toan tap.
• Adding a wildcard symbol may retrieve word variants: so bien tinh - ((hanh hang) or (hung thang)) cua khong ((cong tan) or (huong dan)) toan tap*.