Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh dieu » dang dieu, dan dieu, danh dien
dieu cua » dieu tra
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
va nang » van nang, da nang, kha nang
te sach » toc sach
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((va nang) OR (cam nang)) xa hoi. hieu ve chat ((soc va) or (doc va)) danh dieu cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((va nang) OR (cam nang)) xa hoi. hieu ve chat ((soc va) OR (doc va)) danh dieu cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((va nang) OR (cam nang)) xa hoi. hieu ve chat ((soc va) or (doc va)) danh dieu cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((va nang) OR (cam nang)) xa hoi. hieu ve chat ((soc va) or (doc va)) danh dieu cua triet*.