Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu xanh » tieu danh, chieu xanh, dieu hanh
chinh cua » chinh ca, chinh sua, chinh luan
hinh cua » sinh cua, tinh cua, dinh cua
cong tan » cong tac, cong san, cong thanh
tran tap » toan tap, tran tuan, trang tai
tran tan » tran tuan, tran van, tran thanh

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 ((chinh cua) OR (hinh cua)) nhung cong tan ((tran tap) OR (tran tan))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh ((chinh cua) OR (hinh cua)) nhung cong tan ((tran tap) or (tran tan))~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh ((chinh cua) OR (hinh cua)) nhung cong tan ((tran tap) or (tran tan))*.