Perhaps you should try some spelling variations:
sach hay » sach han, sach ha, sach nay
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
vat hanh » vat thanh, van hanh, va hanh
sach ly » sach lo, sach ty, sach luu
lang xa » lang ha, dang xay, lang van
van lam » van nam
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 ly) OR (sach hay))) or (sach y)) lang xa hoi. hieu van lam thuc vat hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ly) OR (sach hay))) OR (sach y)) lang xa hoi. hieu van lam thuc vat hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((((sach ly) OR (sach hay))) or (sach y)) lang xa hoi. hieu van lam thuc vat hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ly) OR (sach hay))) or (sach y)) lang xa hoi. hieu van lam thuc vat hanh vi cuu tre*.