Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tang luan » dung luan
nang cong » nang song, dang cong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
hang ca » hang va, nang cao, hang tai
dan van » dang van, doan van, dao van
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 ((tang luan) or (hang ca)) nang cong dan van ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh ((tang luan) OR (hang ca)) nang cong dan van ca*.