Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thong cong » trong cong, tong cong, thong thong
tung tuan » trung tuan, quang tuan, trang tuan
hung tuan » hung tran, quang tuan, trung tuan
ho chieu » theo chieu, hoc thieu, doi chieu
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
phan cau » phan dau, phan cac, phan tu

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: ho chieu xanh - thanh ((tung tuan) OR (hung tuan)) thong cong san ((toan cau) OR (phan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - thanh ((tung tuan) OR (hung tuan)) thong cong san ((toan cau) or (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - thanh ((tung tuan) OR (hung tuan)) thong cong san ((toan cau) or (phan cau))*.