Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh tram » hanh tam, hanh trang, thanh tran
van thong » van thuong, van phong, va thong
ho nhieu » hop nhieu, ho chieu, he nhieu
tram van » tran van, tam van, trang 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 tang - hanh tram van thong cong ((hai quan) OR (bai toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: ho nhieu tang - hanh tram van thong cong ((hai quan) or (bai toan)) cau*.