Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh trung » thanh trung, hanh trang, manh trung
duong cong » dung cong, luong cong, duong trong
trung cua » truong cua, trung tuan, trung cap
dong cong » dung cong, dang cong, cong cong
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: nhat ((chieu sang) or (chieu sach)) - hanh trung cua ((dong cong) OR (duong cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nhat ((chieu sang) OR (chieu sach)) - hanh trung cua ((dong cong) OR (duong cong)) tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nhat ((chieu sang) or (chieu sach)) - hanh trung cua ((dong cong) OR (duong cong)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: nhat ((chieu sang) or (chieu sach)) - hanh trung cua ((dong cong) OR (duong cong)) tac toan cau*.