Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, tien anh
hang cong » dang cong, hang nong, bang cong
trang va » hang va
tran van » luan van
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than ban » thanh ban, toan ban, than man

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) OR (dieu hanh)) - hanh ((trang va) or (tran van)) hang cong van than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu xanh) OR (dieu hanh)) - hanh ((trang va) OR (tran van)) hang cong van than ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu xanh) OR (dieu hanh)) - hanh ((trang va) or (tran van)) hang cong van than ban".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu xanh) OR (dieu hanh)) - hanh ((trang va) or (tran van)) hang cong van than ban*.