Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, tu cach, vu sach
te sach » toc sach
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac
dao vai » dao van, dao va, dao bai
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
tuc va » thuc va, truc va, tuc xa
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) OR (thu sach))) or (te sach)) y lang xa hoi. hieu qua cac tuc va dao vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (te sach)) y lang xa hoi. hieu qua cac tuc va dao vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (thu sach))) or (te sach)) y lang xa hoi. hieu qua cac tuc va dao vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (thu sach))) or (te sach)) y lang xa hoi. hieu qua cac tuc va dao vai cua tre*.