Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, kieu tinh
tranh cua » manh cua
doanh cua » doanh luan
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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 tinh - canh ((tranh cua) OR (doanh cua)) dong ((cong dan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - canh ((tranh cua) OR (doanh cua)) dong ((cong dan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu tinh - canh ((tranh cua) OR (doanh cua)) dong ((cong dan) or (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - canh ((tranh cua) OR (doanh cua)) dong ((cong dan) or (cong san)) toan cau*.