Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thanh tung » thanh cong
cong thanh » dong thanh, cong trinh, cong tan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dang cong » dung cong
tung cua » trung cua, tuong cua, dung cua
cua dang » cua cong, cua ban
toan ban » van 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 thiet tach - thanh tung cua dang cong thanh ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh tung cua dang cong thanh ((toan tap) OR (toan ban))*.