Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh qua » tranh cua, thanh qua, trinh qua
cong sang » cong lang, cong vang, cong bang
qua dung » quang dung, su dung, qua song
cong san » cong tac
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu manh) or (chieu sang)) - canh tranh qua dung ((cong san) or (cong sang)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu manh) OR (chieu sang)) - canh tranh qua dung ((cong san) OR (cong sang)) toan tap.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu manh) or (chieu sang)) - canh tranh qua dung ((cong san) or (cong sang)) toan tap*.