Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong duong » tuong duong, thong dung, thong huong
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
duong tac » tuong tac, duong tai, dong tac
trung he » trung ha, trong he, trung hieu
quan ha » quan he

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu tinh) or (chieu sach)) - thanh trung he thong duong tac quan ha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu tinh) OR (chieu sach)) - thanh trung he thong duong tac quan ha.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tinh) or (chieu sach)) - thanh trung he thong duong tac quan ha*.