Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
luan dang » luan nang, luan danh, luan dong
dang cong » dung cong
van thanh » van tuan
ban thanh » ban hanh, ban hang
toc hieu » toc thieu, doc hieu, hoc thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu lang - ((hanh tang) or (canh tranh)) luan dang cong ((van thanh) OR (ban thanh)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu lang - ((hanh tang) OR (canh tranh)) luan dang cong ((van thanh) OR (ban thanh)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc hieu lang - ((hanh tang) or (canh tranh)) luan dang cong ((van thanh) OR (ban thanh)) ban".
• Adding a wildcard symbol may retrieve word variants: toc hieu lang - ((hanh tang) or (canh tranh)) luan dang cong ((van thanh) OR (ban thanh)) ban*.