Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien cach » hieu cach, thien hach, khien canh
dung cong » dung trong
hien cac » thien cac, vien cac, hieu cac
tam dung » tam duong, tac dung, tan dung
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien cach) OR (hien cac)) - thanh trung tam dung cong tan ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien cach) OR (hien cac)) - thanh trung tam dung cong tan ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien cach) OR (hien cac)) - thanh trung tam dung cong tan ((toan cau) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien cach) OR (hien cac)) - thanh trung tam dung cong tan ((toan cau) or (toan tap))*.