Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vat hanh » vat thanh, van hanh, va hanh
so sach » so sanh, bo sach, co sach
ve nham » ve cham
cua tre » cua te, cuu tre, cua triet
ve nha » ke nha
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (thuoc sach)) ky nang x hoi. hieu ((ve nham) OR (ve nha)) thuc vat hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (thuoc sach)) ky nang x hoi. hieu ((ve nham) OR (ve nha)) thuc vat hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (thuoc sach)) ky nang x hoi. hieu ((ve nham) OR (ve nha)) thuc vat hanh vi cua tre*".