Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
bang cong » bang song, hang cong, dung cong
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trinh toan ((dang cong) OR (bang cong)) van toan ban~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trinh toan ((dang cong) or (bang cong)) van toan ban*.