Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tran » hanh trang, thanh tran, hanh tram
van nhung » van nhuong, va nhung, van hung
cong vang » cong lang, cong quang, cong ngang
vang tuan » van tuan, vong tuan, quang tuan
tran van » luan van
tuan cu » tuan tu, quan cua, tuan thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hien) or (toc thieu)) sach - hanh tran van nhung cong vang tuan cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (toc thieu)) sach - hanh tran van nhung cong vang tuan cu*.