Perhaps you should try some spelling variations:
doi chieu » doc hieu, ho chieu, mot chieu
hanh sinh » hanh tinh, hanh dinh, hinh sinh
dong cong » duong cong, dung cong, dang cong
sinh cua » manh cua, dinh cuu, sinh va
cua dong » chua dong, cua cong, cua dang
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doi chi)) tinh - hanh sinh cua dong cong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) tinh - hanh sinh cua dong cong dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doi chi)) tinh - hanh sinh cua dong cong dan ((toan cao) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doi chi)) tinh - hanh sinh cua dong cong dan ((toan cao) or (toan ban))*.