Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
hoc chieu » hoc thieu, ho chieu, hoc hien
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
cong cong » cong dong, trong cong, dung cong
doan van » doan va, hoang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sach - hanh tang luan ((thong cong) or (cong cong)) doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh tang luan ((thong cong) OR (cong cong)) doan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh tang luan ((thong cong) or (cong cong)) doan van ban*.