Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
toan tai » toan tap, doanh tai, von tai
toan ban » van ban
toan cao » toan tap

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 - canh tranh cua dung cong dan ((((toan tai) OR (toan ban))) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh tranh cua dung cong dan ((((toan tai) OR (toan ban))) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh tranh cua dung cong dan ((((toan tai) OR (toan ban))) or (toan cao))*.