Perhaps you should try some spelling variations:
chiet tach » chieu sach
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
hanh tran » hanh trang, thanh tran, hanh tram
van nhung » van nhuong, va nhung, van hung
tran van » luan van
ban thai » ban than, ban thi, ban thoi
ban tai » van tai, han tai, ban thi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (chieu xanh)) - hanh tran van nhung cong ((ban thai) OR (ban tai)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (chieu xanh)) - hanh tran van nhung cong ((ban thai) OR (ban tai)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (chieu xanh)) - hanh tran van nhung cong ((ban thai) OR (ban tai)) cao*.