Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
tung dan » dung dan, trung dai, dung dat
van cong » van dong, van phong, phan cong
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - thanh ((tung dan) or (huong dan)) van cong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - thanh ((tung dan) OR (huong dan)) van cong ban than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh ((tung dan) or (huong dan)) van cong ban than cau*.