Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu tinh » lieu tinh, kieu tinh, hieu binh
tranh va » tranh van, trang va, trinh va
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tap
va lang » va nang, hoa lang

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