Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ve nam » he nam, va nam, le nam
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: ((((tu sach) or (thuoc sach))) or (su sach)) ky lang xa hoi. hieu ve nam thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thuoc sach))) OR (su sach)) ky lang xa hoi. hieu ve nam thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (thuoc sach))) or (su sach)) ky lang xa hoi. hieu ve nam thuc va hanh vi cua tre*.