Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
tang van » hoang van, trong van, tang luan
dang van » hoang van, hang va
va triet » va thiet, va trien, ve triet
so sanh » do sanh
qua nam » quan nam, cua nam, quang nam
minh su » hinh su, dinh su, tinh su
nam lo » nam bo, nam so, nam co
lo van » le van, vo van, so van
su va » su van, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (so sanh)) ty ((tang van) or (dang van)) hoc. hieu qua nam lo van minh su va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sanh)) ty ((tang van) OR (dang van)) hoc. hieu qua nam lo van minh su va triet.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (so sanh)) ty ((tang van) or (dang van)) hoc. hieu qua nam lo van minh su va triet*.