Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
than sinh » than kinh, nhan sinh, thai sinh
bang cong » dang cong, bang song, hang cong
hang nong » thang long, han tong
van toan » van tuan, van tan, van thanh
toan tap » toan ban
sinh va » sinh vat, tinh va, dinh van

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 xanh - than sinh va ((bang cong) or (hang nong)) van toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - than sinh va ((bang cong) OR (hang nong)) van toan tap.
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - than sinh va ((bang cong) or (hang nong)) van toan tap*.