Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
cua dung » cua dang, cua dong, qua dung
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - hanh trung cua dung cong ((bai toan) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - hanh trung cua dung cong ((bai toan) OR (tan tran)) cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - hanh trung cua dung cong ((bai toan) or (tan tran)) cau*.