Perhaps you should try some spelling variations:
vat dung » van dung, va dung, viet dung
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lang xa » dang xay, lang van
lang ha » long ha
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc vat » thuc vat, tuc va, tuc hat
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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 ((lang xa) or (lang ha)) hoi. hieu va cam tuc vat dung tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (lang ha)) hoi. hieu va cam tuc vat dung tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (lang ha)) hoi. hieu va cam tuc vat dung tai cua tre*.