Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » truong va, trang va, trung ha
tac than » tac thanh, tac nhan, bac thanh
tam than » ban than
lan van » luan van, lang van, tan van

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