Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
thang cua » thong cua, hang cua, than cua
cuong tap » cong tac, luong tai, cong tan
luong tap » luong tai, luong tham, luong thai
hoc hieu » hoc thieu, hoc hien, doc hieu
manh cua » doanh cua, ban cua
doan dau » doan dieu, phan dau, doan va

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 ((thang cua) OR (manh cua)) nhung ((cuong tap) OR (luong tap)) doan dau~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh ((thang cua) or (manh cua)) nhung ((cuong tap) or (luong tap)) doan dau*.