Perhaps you should try some spelling variations:
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
doi chiet » doi chieu, doi chi, doi viet
trung cap » truong cao, trung tam
dung cong » dung trong
tan thanh » tran thanh, tang thanh, toan thanh
thanh lap » thanh san, phan lap, thanh hai
cong tan » cong tac, cong san, cong thanh

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

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