Perhaps you should try some spelling variations:
thanh tinh » thanh binh, nhanh tinh, hanh trinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
cong nong » cong dong, cong cong, cong trong
doc hieu » toc thieu, hoc thieu, hoc hien
nong san » cong san, dong san, nong dan
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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: doc hieu xanh - ((thanh tinh) OR (than kinh)) cua cong nong san ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - ((thanh tinh) or (than kinh)) cua cong nong san ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((thanh tinh) or (than kinh)) cua cong nong san ((toan cau) OR (toan ban))*.