Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
mang cua » manh cua, ban cua, cong cua
dung cua » dung luan, dung cho
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban

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 xanh - hanh ((mang cua) or (dung cua)) dung cong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((mang cua) OR (dung cua)) dung cong dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((mang cua) or (dung cua)) dung cong dan ((toan cao) or (toan ban))*.