Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
nong san » cong san, dong san, trong san
nong dan » cong dan, nguong dan, huong dan
tran van » luan van

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: hoc thieu xanh - hanh tranh cua cong ((nong san) OR (nong dan)) tran van~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh tranh cua cong ((nong san) or (nong dan)) tran van*.