Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hop nhieu » hoc thieu, ho chieu, he nhieu
hanh tran » hanh trang, thanh tran, hanh tram
van thong » van thuong, van phong, va thong
ho nhieu » ho chieu, he nhieu, hoc thieu
tran van » luan van
hai quan » tac quan
bai toan » bai tap

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 nhieu) OR (hop nhieu)) tang - hanh tran van thong cong ((hai quan) OR (bai toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho nhieu) OR (hop nhieu)) tang - hanh tran van thong cong ((hai quan) or (bai toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho nhieu) OR (hop nhieu)) tang - hanh tran van thong cong ((hai quan) or (bai toan)) cau*.