Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
vat cua » mat cua, bat cua, dat cua
dan vat » dang vat, van vat, dan va
cac tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, xach tay
cua tre » cua te, cuu tre, cua triet
tac va » tac da, tac xa, tuc va
va dan » ca dan, va dao, va dau

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 ky) or (((sach ty) OR (sach thu)))) lang xa hoi. hieu va cac tac va dan vat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (((sach ty) OR (sach thu)))) lang xa hoi. hieu va cac tac va dan vat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (((sach ty) OR (sach thu)))) lang xa hoi. hieu va cac tac va dan vat cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (((sach ty) OR (sach thu)))) lang xa hoi. hieu va cac tac va dan vat cua tre*.