Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach dai » sach dao, sach bai, sach dat
dai nang » da nang, dai dang, dai thang
dan dien » doan dien, danh dien, dan den
te sach » toc sach
nang xa » nang x, lang xa, nang ma
va chat » van chat, va phat, hoa chat
va dan » ca dan, va dao, va dau
cu tre » cu tren, cua tre, cuu tre

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 dai nang xa hoi. hieu ((va chat) OR (cao chat)) hoc va dan dien ((cu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach dai nang xa hoi. hieu ((va chat) OR (cao chat)) hoc va dan dien ((cu tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach dai nang xa hoi. hieu ((va chat) OR (cao chat)) hoc va dan dien ((cu tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach dai nang xa hoi. hieu ((va chat) OR (cao chat)) hoc va dan dien ((cu tre) or (cua triet))*.