Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung cong
trien quang » tran quang, tuyen quang, dien quang
hieu sang » chieu sang, hieu lang, hieu quang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (trien quang)) - canh tranh cua nhung huong ((dan toan) OR (dan than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) or (trien quang)) - canh tranh cua nhung huong ((dan toan) OR (dan than)) cau~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (trien quang)) - canh tranh cua nhung huong ((dan toan) OR (dan than)) cau*.