Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
sinh cua » manh cua, dinh cuu, sinh va
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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 sinh cua nhung ((cong dan) or (cong tan)) ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh sinh cua nhung ((cong dan) OR (cong tan)) ((toan tap) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh sinh cua nhung ((cong dan) or (cong tan)) ((toan tap) or (toan ban))*.