Perhaps you should try some spelling variations:
trung thanh » truong thanh
thiet tach » chiet tach, thien hach, thuat tach
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cap » truong cao, trung tam
thanh hai » thanh phan, thanh hoa, thanh san
cong ban » cong bang, cong san, cong tan
phan lap » phan dau

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

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