Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung tuan » trung thanh, tran tuan, truong thanh
chung nhan » chung khoan, dung nhan, chung nam
chung dan » chung han, hung dan, chung luan
ho chieu » theo chieu, hoc thieu, doi chieu
toan cao » toan ban, toan tap

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

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