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
cong cong » cong dong, trong cong, dung cong
tung cua » trung cua, tuong cua, dung cua
cong san » cong tac
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: hoc thiet tach - thanh tung cua cong cong san ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh tung cua cong cong san ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh tung cua cong cong san ((toan cau) or (toan cao))*.