Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong cong » cong dong, trong cong, dung cong
cong dang » cong dong, cong dan, cong dung
doc hieu » toc thieu, hoc thieu, hoc hien
mang cua » manh cua, dung cua, ban cua
dang van » hoang van, hang va
hang ca » hang va, nang cao, hang tai
van ca » van cau, van cua, dan ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu manh - hanh ((hang ca) or (mang cua)) cong cong dang van ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh ((hang ca) OR (mang cua)) cong cong dang van ca*.