Perhaps you should try some spelling variations:
doc trieu » dong trieu, toc thieu, doc hieu
hanh mang » nhanh mang, hanh trang, nhanh lang
mang cua » manh cua, dung cua, ban cua
cua dong » chua dong, cua cong, cua dang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc trieu tinh - hanh mang cua dong ((cong dan) OR (cong san)) khan cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc trieu tinh - hanh mang cua dong ((cong dan) OR (cong san)) khan cap".
• Adding a wildcard symbol may retrieve word variants: doc trieu tinh - hanh mang cua dong ((cong dan) OR (cong san)) khan cap*.