Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
tieu xanh » tieu danh, chieu xanh, dieu hanh
trong van » trong cac
van thanh » ban thanh, van tuan
thanh tap » thanh lap, thanh tai, thanh tay
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang

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 tranh) OR (hanh trinh)) ((cua tong) OR (cua dong)) trong van thanh tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - ((hanh tranh) or (hanh trinh)) ((cua tong) OR (cua dong)) trong van thanh tap~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - ((hanh tranh) or (hanh trinh)) ((cua tong) OR (cua dong)) trong van thanh tap*.