Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trung tuan » trung thanh, trung tam, truong thanh
trong quan » thong quan, tong quan, thong quang
tran tuan » tran xuan, tran quang, tran thanh
quan toan » quang toan, quan doan, xuan 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: toc thieu xanh - thanh ((trung tuan) OR (tran tuan)) dung trong quan toan cau~.
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - thanh ((trung tuan) or (tran tuan)) dung trong quan toan cau*.