Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
cong bang » cuong bang, dong bang, hong bang
tung tam » trung tam, vung tam, dung tam
tam dung » tam duong, tac dung, tan dung
phap cau » phan cau, pha cau, phap cac
phap ca » phap cac, phap cai, phap va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) or (chieu sang)) - thanh tung tam dung cong bang ((phap cau) OR (phap ca))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (chieu sang)) - thanh tung tam dung cong bang ((phap cau) OR (phap ca)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) or (chieu sang)) - thanh tung tam dung cong bang ((phap cau) OR (phap ca))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (chieu sang)) - thanh tung tam dung cong bang ((phap cau) OR (phap ca))*.