Perhaps you should try some spelling variations:
sach ty » sach y, sach thu, xach tay
va hanh » van hanh, va thanh, va danh
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet
hang x » nang x, hoang xa, chang xu
ve cac » vien cac
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach tu)) hang x hoi. hieu ((ve cac) OR (va cac)) duc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) OR (sach tu)) hang x hoi. hieu ((ve cac) or (va cac)) duc va hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) OR (sach tu)) hang x hoi. hieu ((ve cac) or (va cac)) duc va hanh vi cua tre*.