Perhaps you should try some spelling variations:
tieu trinh » tien trinh, trieu tinh, lieu tinh
hanh tang » hanh trang, anh tang, hanh mang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap
va hang » van hang, va nang, va hanh
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: theo ((tieu trinh) or (tien thinh)) - hanh tang ((va hang) OR (va lang)) cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu trinh) OR (tien thinh)) - hanh tang ((va hang) OR (va lang)) cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu trinh) or (tien thinh)) - hanh tang ((va hang) OR (va lang)) cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu trinh) or (tien thinh)) - hanh tang ((va hang) OR (va lang)) cong tan toan cau*.