Perhaps you should try some spelling variations:
tranh chua » tranh cua, trinh chuan, tranh chap
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
chua hang » cua hang, chua nang, chua xang
hang cong » dang cong, hang nong, bang cong
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 ((chieu sang) OR (hieu lang)) - canh tranh chua hang cong san ((toan tap) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - canh tranh chua hang cong san ((toan tap) OR (van ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - canh tranh chua hang cong san ((toan tap) or (van ban))*".