Perhaps you should try some spelling variations:
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
khong tung » khong dung, khong xuong, chong trung
doi chiet » doi chieu, doi chi, doi viet
trung cua » truong cua, trung cap, dung cua
tung dan » dung dan, huong dan, trung dai
dan phan » doan phan, dan chan, van phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - thanh ((trung cua) or (trung tuan)) khong tung dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - thanh ((trung cua) OR (trung tuan)) khong tung dan phan tu*.