Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
trinh cua » tinh cua, trinh quan, trinh luan
dong cong » duong cong, dung cong, dang cong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh 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: doi ((chieu sach) OR (chieu sang)) - hanh ((trinh cua) OR (trinh luat)) dong cong manh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chieu sang)) - hanh ((trinh cua) or (trinh luat)) dong cong manh toan cau~".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chieu sang)) - hanh ((trinh cua) or (trinh luat)) dong cong manh toan cau*.