Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trang » thanh trung, canh tranh, hanh trinh
lieu tinh » trieu tinh, diep tinh, bien tinh
va duong » van duong, va tuong, va huong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
va dung » van dung, vat dung, va ung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((lieu tinh) or (chieu sang)) - hanh trang ((va dung) or (va duong)) cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((lieu tinh) OR (chieu sang)) - hanh trang ((va dung) OR (va duong)) cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((lieu tinh) or (chieu sang)) - hanh trang ((va dung) or (va duong)) cong dan toan cao*.