Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
thong van » trong van, thong va, thong quan
va thong » va thuong, va phuong, he thong
van toan » van tuan, van tan, van thanh
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - ((canh tranh) or (hanh trinh)) va thong thong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((canh tranh) OR (hanh trinh)) va thong thong van toan ban.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((canh tranh) or (hanh trinh)) va thong thong van toan ban*.