Perhaps you should try some spelling variations:
trong thanh » truong thanh, trung thanh, rong thanh
chieu sach » chinh sach, chiet tach, chieu sang
long muong » lang muong, long vuong, mong muong
thanh phan » thanh pho, thanh san, thanh toan
hoc chieu » hoc thieu, ho chieu, hoc hien
duong ung » duong dung, duong rung, dung ung

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - thanh ((long muong) OR (duong ung)) dung trong thanh phan tu~.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - thanh ((long muong) or (duong ung)) dung trong thanh phan tu*.