Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc van » thuc vat, thuc dan, thuc va
dao thuc » dan thuc, dao tuc, do thuc
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
van anh » van thanh, tuan anh, van minh
cuu tre » cua tre, cau treo
anh va » hanh va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty xang xa hoi. ((hieu va) or (hieu qua)) dao thuc van anh va ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang xa hoi. ((hieu va) OR (hieu qua)) dao thuc van anh va ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty xang xa hoi. ((hieu va) or (hieu qua)) dao thuc van anh va ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang xa hoi. ((hieu va) or (hieu qua)) dao thuc van anh va ((cuu tre) OR (cau tren))*.