Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
vang toan » van toan, dang toan, quang toan
toan cau » toan cao, toan ban, 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: theo tieu xanh - ((hanh tang) OR (hanh mang)) cua ((dong cong) OR (dang cong)) vang toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - ((hanh tang) or (hanh mang)) cua ((dong cong) OR (dang cong)) vang toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - ((hanh tang) or (hanh mang)) cua ((dong cong) OR (dang cong)) vang toan cau*.