Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thanh tung » thanh cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tam thong » tam thuong, tao thong, nam thong
cong bang » cuong bang, dong bang, hong bang
tung tam » trung tam, vung tam, dung tam
cong ban » cong san, cong tan, cong dan
than cau » toan cau, phan cau, than cap
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: hoc thiet tach - thanh tung tam thong ((cong ban) or (cong bang)) ((than cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh tung tam thong ((cong ban) OR (cong bang)) ((than cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh tung tam thong ((cong ban) or (cong bang)) ((than cau) or (toan cao))*.