Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dai thuc » dan thuc, dai thu, dai thua
thuc van » thuc vat, thuc dan, thuc va
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
sach ty » sach y, sach tu, sach thu
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
va dai » va dao, vi dai, va dau
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh

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 ang xa hoi. hieu va dai thuc van ((anh va) or (hanh va)) ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ang xa hoi. hieu va dai thuc van ((anh va) OR (hanh va)) ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ang xa hoi. hieu va dai thuc van ((anh va) or (hanh va)) ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ang xa hoi. hieu va dai thuc van ((anh va) or (hanh va)) ((cua tre) OR (cuu tre))*.