Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trung cao » truong cao, trung cap, trung co
hang cong » dang cong, hang nong, bang cong
dung cong » dung trong
doan phan » doanh phan, toan phan, doanh nhan
dan phan » dan chan, van phan, dam phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - thanh trung cao ((hang cong) or (dung cong)) ((dan phan) or (doan phan)) lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh trung cao ((hang cong) OR (dung cong)) ((dan phan) OR (doan phan)) lap.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh trung cao ((hang cong) or (dung cong)) ((dan phan) or (doan phan)) lap*.