Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach chu » sach che, sach thu, sach thue
chu bang » thu bang, chuc nang, chu quang
qua cham » qua hai, qua cac, va cham
bang xa » lang xa, bang va, mang xa
hanh ly » khanh ly, hanh ky, hang ly
soc va » loc va, doc va, goc va
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach chu bang xa hoi. hieu qua cham ((soc va) or (hoc va)) hanh ly ((cua tu) OR (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach chu bang xa hoi. hieu qua cham ((soc va) OR (hoc va)) hanh ly ((cua tu) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach chu bang xa hoi. hieu qua cham ((soc va) or (hoc va)) hanh ly ((cua tu) OR (cua cu))".
• Adding a wildcard symbol may retrieve word variants: toc sach chu bang xa hoi. hieu qua cham ((soc va) or (hoc va)) hanh ly ((cua tu) OR (cua cu))*.