Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » hieu quang, nhieu tang, hieu van
hanh mang » nhanh mang, hanh trang, nhanh lang
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) OR (hieu lang)) - hanh mang ((cua dung) or (cua dang)) cong trinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - hanh mang ((cua dung) OR (cua dang)) cong trinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - hanh mang ((cua dung) or (cua dang)) cong trinh toan ban".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) OR (hieu lang)) - hanh mang ((cua dung) or (cua dang)) cong trinh toan ban*.