Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
lang van » dang van, tang van, hoang van
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
thuc va » thuc vat, thuc dan, thuc day
hanh va » hanh vi
cua tre » cuu tre, cua triet, dua tren
va nam » van nam, ha nam, va nay
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang van hoa. lieu va nam thuc va ((hanh va) or (hang va)) ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang van hoa. lieu va nam thuc va ((hanh va) OR (hang va)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang van hoa. lieu va nam thuc va ((hanh va) or (hang va)) ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang van hoa. lieu va nam thuc va ((hanh va) or (hang va)) ((cua tre) OR (cua te))*.