Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thieu xanh » chieu xanh, hieu manh, thien danh
thong cong » trong cong, tong cong, thong thong
thien anh » thien danh, tien anh, thien chanh
canh tinh » hanh tinh, manh tinh, canh tranh
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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: hoc ((thieu xanh) OR (((thien anh) OR (thien thanh)))) - canh tinh toan thong cong tap toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (((thien anh) OR (thien thanh)))) - canh tinh toan thong cong tap toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (((thien anh) OR (thien thanh)))) - canh tinh toan thong cong tap toan ban*.