Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
ban thuc » ban thuoc, dan thuc, bao thuc
van thuc » va thuc, dan thuc, van thu
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

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