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
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
doc hieu » toc thieu, hoc thieu, hoc hien
toan ban » van ban

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 lang - ((hanh tang) or (canh tranh)) luan dang cong vang toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - ((hanh tang) OR (canh tranh)) luan dang cong vang toan ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((hanh tang) or (canh tranh)) luan dang cong vang toan ban*.