Perhaps you should try some spelling variations:
tinh thuat » tinh thua, tinh chat, tinh than
nhung cong » dung cong, thong cong, hang cong
tinh thai » sinh thai, tinh toan, tinh chat
hoi hieu » hoi phieu, hoi tieu, moi hieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap
co hieu » cao hieu, doc hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co hieu) or (hoi hieu)) lang - thanh ((tinh thuat) OR (tinh thai)) nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co hieu) OR (hoi hieu)) lang - thanh ((tinh thuat) OR (tinh thai)) nhung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co hieu) or (hoi hieu)) lang - thanh ((tinh thuat) OR (tinh thai)) nhung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((co hieu) or (hoi hieu)) lang - thanh ((tinh thuat) OR (tinh thai)) nhung cong dan toan cau*.