Perhaps you should try some spelling variations:
triet tinh » trieu tinh, trien tinh, trien kinh
canh doanh » hanh doanh, chinh doanh, doanh doanh
phan huong » phan thuong, phan xuong, phan hong
mao triet » tao thiet, va triet, bo triet
luan phan » luan van, luan hoan
manh toan » thanh toan, anh tuan, tinh toan
dan toan » van toan, dan than, xuan toan

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: mao triet tinh - ((canh doanh) OR (kinh doanh)) luan phan huong ((dan toan) OR (manh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "mao triet tinh - ((canh doanh) or (kinh doanh)) luan phan huong ((dan toan) OR (manh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: mao triet tinh - ((canh doanh) or (kinh doanh)) luan phan huong ((dan toan) OR (manh toan)) cau*.