Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh cua » tinh cua, trinh luat, trinh luan
hoc hieu » hoc thieu, hoc hien, doc hieu
dan than » dan chan, ban than, van than
ban hang » ngan hang

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: hoc hieu manh - hanh ((trinh cua) OR (trinh quan)) nhung cong ((dan than) OR (ban hang)) cau~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh ((trinh cua) or (trinh quan)) nhung cong ((dan than) or (ban hang)) cau*.