Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
nhung huong » nhung tuong, nhung cong, nhung dung
truong dao » truong dai, truong cao
truong bo » truong cao
doc hieu » toc thieu, hoc thieu, hoc hien
hieu luc » hieu luat, hieu qua
dan toan » van toan, dan than, manh toan
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: doc hieu luc - thanh ((truong dao) or (truong bo)) ((nhung huong) OR (nhung phuong)) dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu luc - thanh ((truong dao) OR (truong bo)) ((nhung huong) OR (nhung phuong)) dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu luc - thanh ((truong dao) or (truong bo)) ((nhung huong) OR (nhung phuong)) dan toan ban".
• Adding a wildcard symbol may retrieve word variants: doc hieu luc - thanh ((truong dao) or (truong bo)) ((nhung huong) OR (nhung phuong)) dan toan ban*.