Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
hanh tang » hanh trang, hanh mang, hanh tung
luat cong » thuat cong, luat chung, cua cong
cong nong » cong dong, cong cong, cong trong
nong manh » nong lanh, duong manh, hoang manh
anh tang » anh bang, anh dang, anh nang
toan cao » toan ban
toan tap » toan 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: theo tieu xanh - ((hanh tang) OR (anh tang)) luat cong nong manh ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - ((hanh tang) OR (anh tang)) luat cong nong manh ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - ((hanh tang) OR (anh tang)) luat cong nong manh ((toan cao) or (toan tap))*.