Perhaps you should try some spelling variations:
tieu hanh » dieu hanh, tiem hanh, tien hanh
hanh mang » nhanh mang, hanh trang, nhanh lang
hang cong » dang cong, hang nong, bang cong
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang
mang va » mang vua, hang va, bang va
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu hanh - hanh mang va hang cong ((dan than) or (ban than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu hanh - hanh mang va hang cong ((dan than) OR (ban than)) ban*.