Perhaps you should try some spelling variations:
thanh trung » thanh tung
cong thanh » dong thanh, cong trinh, truong thanh
hieu cach » hieu cac, chieu sach, hieu ca
trung cua » truong cua, trung tuan, trung cap
toc hieu » toc thieu, doc hieu, hoc thieu
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong ty
toan cau » toan ban, toan tap, toan tai
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: toc hieu cach - thanh trung cua dung ((cong tan) or (cong thanh)) ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu cach - thanh trung cua dung ((cong tan) OR (cong thanh)) ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc hieu cach - thanh trung cua dung ((cong tan) or (cong thanh)) ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: toc hieu cach - thanh trung cua dung ((cong tan) or (cong thanh)) ((toan cau) OR (toan cao))*.