Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hung cuong » hung vuong, hong cuong, hung luong
so thiet » soc thiet, hoc thiet, hoa thiet
cong tai » cong thai, cong tac, dong tai
tai hung » mai hung, tai phuong, tai thuong
bai than » ban than, bay than, tai thanh
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: so thiet tach - thanh cong tai hung cuong ((bai than) or (bai toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - thanh cong tai hung cuong ((bai than) OR (bai toan)) cau.
• Adding a wildcard symbol may retrieve word variants: so thiet tach - thanh cong tai hung cuong ((bai than) or (bai toan)) cau*.