Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu xanh » tieu danh, chieu xanh, dieu hanh
tranh van » trinh van, thanh van, tranh ban
thanh cac » hanh cac, thanh bac, thanh ca
tran van » luan van
cong san » cong tac
than cap » khan cap, thanh lap, than cua

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 ((tranh van) OR (tran van)) nhung cong san ((than cap) OR (thanh cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh ((tranh van) OR (tran van)) nhung cong san ((than cap) or (thanh cac))~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh ((tranh van) OR (tran van)) nhung cong san ((than cap) or (thanh cac))*.