Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cac » trong cac, phong cach, thong cua
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » truong va, trang va, trung ha
tran van » luan van
cac than » cac thanh, cac nhan, cac phan
than cau » toan cau, phan cau, than cap

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