Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
theo lieu » theo tieu, theo chieu, theo yeu
lieu nang » lieu nano, lieu giang, lieu cong
cua thong » cua thuong, cua khong, cua tong
hua khong » hoa khong, cua khong, hoac khong
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo lieu nang - hanh tranh ((cua thong) or (hua khong)) cong ((tac toan) or (tam toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo lieu nang - hanh tranh ((cua thong) OR (hua khong)) cong ((tac toan) OR (tam toan)) cau.
• Adding a wildcard symbol may retrieve word variants: theo lieu nang - hanh tranh ((cua thong) or (hua khong)) cong ((tac toan) or (tam toan)) cau*.