Perhaps you should try some spelling variations:
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
hanh tran » hanh trang, thanh tran, hanh tram
van nhung » van nhuong, va nhung, van hung
cong vang » cong quang, cong ngang, cong san
cong lang » cong luong, cong quang, cong ngang
tuan dang » tran dang, tuan bang, tuan dung
tran 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 ((hien sach) OR (kien sach)) - hanh tran van nhung ((cong vang) or (cong lang)) tuan dang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - hanh tran van nhung ((cong vang) OR (cong lang)) tuan dang.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (kien sach)) - hanh tran van nhung ((cong vang) or (cong lang)) tuan dang".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (kien sach)) - hanh tran van nhung ((cong vang) or (cong lang)) tuan dang*.