Perhaps you should try some spelling variations:
dinh dien » tinh dien, kinh dien, dich dien
sach van » sach han, bach van, cach van
qua cham » qua hai, qua cac, va cham
dien cua » dieu cua, dien cuc, dien cu
sach va » sach xa, sach ha, sach dao
soc va » loc va, doc va, goc va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 van) OR (sach va)) nang x hoi. hieu qua cham ((soc va) or (hoc va)) dinh dien cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach van) OR (sach va)) nang x hoi. hieu qua cham ((soc va) OR (hoc va)) dinh dien cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach van) OR (sach va)) nang x hoi. hieu qua cham ((soc va) or (hoc va)) dinh dien cua te".
• Adding a wildcard symbol may retrieve word variants: te ((sach van) OR (sach va)) nang x hoi. hieu qua cham ((soc va) or (hoc va)) dinh dien cua te*.