Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
tong dan » tuong dan, thong dan, trong dan
than cao » toan cao, than cap, than sao
thai cao » tai cao, thoai cac, thuat cao
cua han » cua hang, cua nhan, cua phan

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) or (hieu qua)) - hanh trung cua han tong dan ((than cao) or (thai cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu qua)) - hanh trung cua han tong dan ((than cao) OR (thai cao)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu qua)) - hanh trung cua han tong dan ((than cao) or (thai cao))*.