Perhaps you should try some spelling variations:
thanh dong » thanh duong, thanh cong, hanh dong
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
toc hieu » doc hieu, hoc thieu, thuc hieu
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 hieu) OR (toc thieu)) nganh - thanh dong cua ((nhung cong) or (dung cong)) bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc hieu) OR (toc thieu)) nganh - 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 hieu) OR (toc thieu)) nganh - thanh dong cua ((nhung cong) or (dung cong)) bai toan ban".
• Adding a wildcard symbol may retrieve word variants: ((toc hieu) OR (toc thieu)) nganh - thanh dong cua ((nhung cong) or (dung cong)) bai toan ban*.