Perhaps you should try some spelling variations:
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
chu xanh » chieu xanh, chua xang, chuc danh
chu manh » ho manh, chu han, chu van
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
toan cao » toan ban, toan tap

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: chao ((chu xanh) OR (chu manh)) - ((thanh trung) OR (thanh tung)) va nhung cong bai toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "chao ((chu xanh) or (chu manh)) - ((thanh trung) OR (thanh tung)) va nhung cong bai toan cao~".
• Adding a wildcard symbol may retrieve word variants: chao ((chu xanh) or (chu manh)) - ((thanh trung) OR (thanh tung)) va nhung cong bai toan cao*.