Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trinh » canh tranh, hanh chinh
trinh hoat » trinh hoa, trinh hoan, trinh luat
thang long » thanh cong
hoc chieu » hoc thieu, ho chieu, hoc hien
dang cong » dung cong
sat phan » sat nhan, vat phan, xuat phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sang - hanh trinh hoat ((dang cong) or (thang long)) sat phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh trinh hoat ((dang cong) OR (thang long)) sat phan tu*.