Perhaps you should try some spelling variations:
canh tinh » hanh tinh, manh tinh, canh tranh
hoc hieu » hoc thieu, hoc hien, hoc dieu
doc hieu » toc thieu, hoc thieu, hoc hien
tinh xay » trinh xay, tinh tay, trinh xac
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hieu) OR (doc hieu)) nganh - canh tinh xay dung ((cong dan) or (cong san)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (doc hieu)) nganh - canh tinh xay dung ((cong dan) OR (cong san)) phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) OR (doc hieu)) nganh - canh tinh xay dung ((cong dan) or (cong san)) phan dau".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) OR (doc hieu)) nganh - canh tinh xay dung ((cong dan) or (cong san)) phan dau*.