Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhiet tach » chiet tach
hoc nhiet » hoc thiet, hoc nghien, hoc hien
trung va » truong va, trang va, trung ha
cong sat » cong suat, cong hat, cong nhat
cong san » cong tac
phan dau » phan tu
hang dau » hang va, hang tai

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

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