Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
ban nguong » tin nguong, ban huong, ban tuong
hoc thien » hoc hien, hoc thieu, hoc thiet
hanh tang » hanh trang, anh tang, hanh mang
manh toan » thanh toan, anh tuan, tinh toan
tang cua » mang cua, hang cua, tang luan
dan toan » van toan, dan than, xuan toan

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - hanh tang cua ban nguong ((dan toan) OR (manh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh tang cua ban nguong ((dan toan) OR (manh toan)) cau*.