Perhaps you should try some spelling variations:
dinh dien » tinh dien, kinh dien, dich dien
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
dien cua » dieu cua, dien cuc, dien cu
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
cua tre » cua te, cuu tre, cua triet
doc va » duoc va, duc va, loc 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) or (toc sach)) va nang xa hoi. hieu van cham ((hoc va) or (doc va)) dinh dien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) va nang xa hoi. hieu van cham ((hoc va) OR (doc va)) dinh dien cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) va nang xa hoi. hieu van cham ((hoc va) or (doc va)) dinh dien cua tre*.