Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, nhieu tang
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » hieu quang, nhieu tang, hieu van
trung cua » truong cua, trung tuan, trung cap
ban cong » bang cong, van cong, phan cong
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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: theo ((chieu xanh) or (((hieu lang) OR (chieu sang)))) - hanh trung cua ban cong bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (((hieu lang) OR (chieu sang)))) - hanh trung cua ban cong bai toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (((hieu lang) OR (chieu sang)))) - hanh trung cua ban cong bai toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (((hieu lang) OR (chieu sang)))) - hanh trung cua ban cong bai toan cao*.