Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
cac toc » cac toi, cac nuoc, cac thoi
vai cua » hai cua, lai cua, bai cua
y lang » o lang, _ lang, tay lang
toc va » hoc va, toc ta, tuc va
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y lang xa hoi. hieu qua cac toc va dao ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y lang xa hoi. hieu qua cac toc va dao ((vai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y lang xa hoi. hieu qua cac toc va dao ((vai cua) or (dai cua)) tre*.