Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu cach » hieu cac, chieu sach, hieu ca
dap nhung » vap nhung, dap ung, cam nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cach - thanh trung ((dap nhung) or (va nhung)) cong san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - thanh trung ((dap nhung) OR (va nhung)) cong san than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - thanh trung ((dap nhung) or (va nhung)) cong san than cau*.