Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
dien cua » dieu cua, dien cuc, dien cu
toc sach » hoc sach, doc sach, thuoc sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va nang » van nang, da nang, cam nang
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
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) OR (toc sach)) va nang xa hoi. hieu ve cham ((soc va) or (doc va)) danh 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 ve cham ((soc va) OR (doc va)) danh dien cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) va nang xa hoi. hieu ve cham ((soc va) or (doc va)) danh dien cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) va nang xa hoi. hieu ve cham ((soc va) or (doc va)) danh dien cua tre*.