Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
dang xa » dang xay, lang xa, dang ha
qua cac » cua cac
cac tac » cac toc, cac bac, cac dac
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
y dang » ky dang, 2 dang, _ dang
tac va » tac da, tac xa, 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: tu sach y dang xa hoi. hieu qua cac tac va dao ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dang xa hoi. hieu qua cac tac va dao ((vai cua) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y dang xa hoi. hieu qua cac tac va dao ((vai cua) or (hai cua)) tre*.