Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
truong ca » truong cao, truong va, truong dai
dung cong » dung trong
trong ca » trong cac, trong nha
cong rac » cong tac, cong cac, cong dac
rac toan » hach toan, bai toan, tap 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 - thanh ((trung cua) OR (((truong ca) OR (trong ca)))) dung cong rac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - thanh ((trung cua) or (((truong ca) OR (trong ca)))) dung cong rac toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - thanh ((trung cua) or (((truong ca) OR (trong ca)))) dung cong rac toan cau*.