Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
nhung cong » dung cong, thong cong, nhung don
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hang cong » dang cong, hang nong, bang cong
cong cua » cong cu, dong cua, huong cua
ban than » ban thanh, van thanh, ban hang

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 cong cua ((nhung cong) OR (hang cong)) ((tam than) or (ban than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh cong cua ((nhung cong) OR (hang cong)) ((tam than) OR (ban than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - thanh cong cua ((nhung cong) OR (hang cong)) ((tam than) or (ban than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh cong cua ((nhung cong) OR (hang cong)) ((tam than) or (ban than)) cau*.