Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh han » trinh quan
lang cong » bang cong, hang cong, lang dong
dang cong » dung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
han hang » hang hang, han chang, ban hang
sat phan » sat nhan, vat phan, xuat phan

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 - trinh han hang ((lang cong) or (dang cong)) sat phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - trinh han hang ((lang cong) OR (dang cong)) sat phan tu*.