Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
can thuc » dan thuc, van thuc, cay thuc
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
ve can » ve canh, ve cac, ve ban
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: ((thu sach) or (te sach)) ky lang ha noi. hieu ve can thuc va hanh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky lang ha noi. hieu ve can thuc va hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky lang ha noi. hieu ve can thuc va hanh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky lang ha noi. hieu ve can thuc va hanh vi ((cua tre) OR (cua te))*.