Perhaps you should try some spelling variations:
hoc thieu » toc thieu
hanh tang » hanh trang, anh tang, hanh mang
nong cong » cong cong, tong cong, nang cong
tang cua » mang cua, hang cua, tang luan
cua nong » cua cong, cuu nong, cua dong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang 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 thieu) or (hoc hien)) sach - hanh tang cua nong cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (hoc hien)) sach - hanh tang cua nong cong tan van ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) sach - hanh tang cua nong cong tan van ban*.