Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
hanh mang » nhanh mang, hanh trang, nhanh lang
dang cong » dung cong
mang van » dang van, tang van, lang van
van dang » van dong, van dung, van nang
tan than » tan thanh, tan tran, tam than
ban than » ban thanh, van thanh, ban hang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - hanh mang van dang cong ((tan than) OR (ban than)) ban~.
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh mang van dang cong ((tan than) or (ban than)) ban*.