Perhaps you should try some spelling variations:
thiet ngan » hiem ngan, thien nga, thien nhan
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
thi ngan » tai ngan, thu ngan, thi nga
tang cua » mang cua, hang cua, tang luan
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
san van » tan van, luan van, tran 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 ((thiet ngan) or (thi ngan)) - hanh tang cua dung cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet ngan) OR (thi ngan)) - hanh tang cua dung cong san van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet ngan) or (thi ngan)) - hanh tang cua dung cong san van ban*.