Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van dinh » van minh, van dich, va dinh
dinh di » dinh du, dinh vi, danh di
duc van » duc va, duc tan, duc manh
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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: ((thu sach) OR (su sach)) ((ky lang) OR (ky tang)) xa hoi. hieu ve pham duc van dinh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ((ky lang) OR (ky tang)) xa hoi. hieu ve pham duc van dinh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ((ky lang) OR (ky tang)) xa hoi. hieu ve pham duc van dinh di cua tre*.