Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
dang cong » dung cong
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu
tang va » trang va, tang van, thang va

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 manh - anh ((tang va) or (tran van)) dang cong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu manh - anh ((tang va) OR (tran van)) dang cong dan toan tap.
• Adding a wildcard symbol may retrieve word variants: ho hieu manh - anh ((tang va) or (tran van)) dang cong dan toan tap*.