Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
hang cong » dang cong, hang nong, bang cong
dung cong » dung trong
ngang tan » nganh toan, nang tai, nang tao
trung va » truong va, trang va, trung ha
tung va » tuong va, dung va, vung va
tan cao » toan cao, tao cao, tay cao

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 - thanh ((tung va) OR (trung va)) ((hang cong) OR (dung cong)) ngang tan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - thanh ((tung va) OR (trung va)) ((hang cong) or (dung cong)) ngang tan cao~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - thanh ((tung va) OR (trung va)) ((hang cong) or (dung cong)) ngang tan cao*.