Perhaps you should try some spelling variations:
tranh luat » trinh luat, tranh luan, tranh cua
thieu xanh » chieu xanh, thien anh, thien danh
trinh luan » trinh luat, trinh quan, trinh han
canh duong » anh duong, thanh duong, anh huong
hieu manh » chieu xanh, hieu nganh, dieu hanh
duong dan » duong dang, huong dan, duong van
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan 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 ((thieu xanh) OR (hieu manh)) - canh ((tranh luat) or (trinh luan)) canh duong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - canh ((tranh luat) OR (trinh luan)) canh duong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - canh ((tranh luat) or (trinh luan)) canh duong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - canh ((tranh luat) or (trinh luan)) canh duong dan toan cau*.