Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
trang va » tran van, hang va
trung ha » trung hoc, trung tam, trung cap
trong ca » trong cac, trong nha
toan cao » toan ban, toan tap
ca toan » cua toan, va toan, bai toan

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 (chieu sang)) - thanh ((trang va) or (trung ha)) dung trong ca toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chieu sang)) - thanh ((trang va) OR (trung ha)) dung trong ca toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) OR (chieu sang)) - thanh ((trang va) or (trung ha)) dung trong ca toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) OR (chieu sang)) - thanh ((trang va) or (trung ha)) dung trong ca toan cao*.