Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
lam thuc » lam thuoc, am thuc, nam thuc
vat hanh » vat thanh, van hanh, va hanh
sach ly » sach lo, sach ty, sach hay
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
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 y)) lang xa hoi. ((hieu van) OR (hieu va)) 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 y)) lang xa hoi. ((hieu van) OR (hieu va)) 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 y)) lang xa hoi. ((hieu van) OR (hieu va)) lam thuc vat hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ly) or (sach y)) lang xa hoi. ((hieu van) OR (hieu va)) lam thuc vat hanh vi cuu tre*.