Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
nhung cong » dung cong, thong cong, hang cong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
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 chiet tach - ((thanh trung) or (canh tranh)) va nhung cong san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - ((thanh trung) OR (canh tranh)) va nhung cong san than cau.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - ((thanh trung) or (canh tranh)) va nhung cong san than cau*.