Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
trung tuan » trung tam, tran tuan, truong thanh
trong bac » trong cac, trong ban, trong ba
bac thanh » ban thanh, cac thanh, tai thanh
thanh van » thanh san, thanh toan, thanh phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) or (chieu sach)) - hanh ((trung tuan) OR (trung thanh)) dung trong bac thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sach)) - hanh ((trung tuan) OR (trung thanh)) dung trong bac thanh van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chieu sach)) - hanh ((trung tuan) OR (trung thanh)) dung trong bac thanh van".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sach)) - hanh ((trung tuan) OR (trung thanh)) dung trong bac thanh van*.