Perhaps you should try some spelling variations:
tranh luat » trinh luat, tranh luan, trinh luan
hieu manh » chieu xanh, hieu nganh, hien hanh
canh tung » manh tung, hanh tung, thanh tung
canh cung » manh cuong, canh duong, canh huong
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (dieu hanh)) - canh tranh luat ((canh tung) OR (canh cung)) dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (dieu hanh)) - canh tranh luat ((canh tung) OR (canh cung)) dan than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (dieu hanh)) - canh tranh luat ((canh tung) OR (canh cung)) dan than tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (dieu hanh)) - canh tranh luat ((canh tung) OR (canh cung)) dan than tap*.