Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh dong » thanh duong, thanh cong, hanh dong
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
dong cua » dung cua, cong cua, huong cua
bai toan » bai tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu xanh - thanh dong cua ((nhung cong) OR (dung cong)) bai toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu xanh - thanh dong cua ((nhung cong) OR (dung cong)) bai toan ban".
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - thanh dong cua ((nhung cong) OR (dung cong)) bai toan ban*.