Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh tranh » canh tranh, hanh trinh, lanh tranh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than cau » toan cau, phan cau, than cap

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 - ((hanh tranh) or (hanh trang)) va nhung cong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - ((hanh tranh) OR (hanh trang)) va nhung cong ban than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - ((hanh tranh) or (hanh trang)) va nhung cong ban than cau*.