Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » truong va, trang va, trung ha
va trong » va truong, va thong, va tuong
tac than » tac thanh, tam than, tac nhan
cac nhan » ca nhan, cac nha, cam nhan

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 va trong cong ((tac than) or (cac nhan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh trung va trong cong ((tac than) OR (cac nhan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh trung va trong cong ((tac than) or (cac nhan)) cau*.