Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
trung tuan » trung thanh, trung tam, tran tuan
doi chieu » doc hieu, doi chi, mot chieu
tuan cong » thuan cong, luan cong, tran cong
tuong dan » huong dan, xuong dan, truong dai
tung dan » dung dan, huong dan, trung dai
phan dau » phan tu, hang dau

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 sach - thanh trung tuan cong ((tuong dan) or (tung dan)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh trung tuan cong ((tuong dan) OR (tung dan)) phan dau*.