Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
anh quang » anh xquang, anh quan, nhanh quang
quang cua » quan cua, quang tuan, quang huy
dang cong » dung cong
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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 chieu xanh - anh quang cua ((dang cong) OR (dung trong)) tan ((than cau) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - anh quang cua ((dang cong) or (dung trong)) tan ((than cau) OR (than cap))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - anh quang cua ((dang cong) or (dung trong)) tan ((than cau) OR (than cap))*.