Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, hanh dong
thuc hieu » thuc hien, thu hien, thuc tien
bang cong » dang cong, bang song, hang cong
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: ((thuc hieu) or (toc thieu)) manh - thanh dong cua ((bang cong) or (dung cong)) bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuc hieu) OR (toc thieu)) manh - thanh dong cua ((bang cong) OR (dung cong)) bai toan ban.
• Adding a wildcard symbol may retrieve word variants: ((thuc hieu) or (toc thieu)) manh - thanh dong cua ((bang cong) or (dung cong)) bai toan ban*.