Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van dinh » van minh, van dich, va dinh
ve pham » v pham, ve phan, ve phat
duc van » duc va, duc tan, duc manh
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
vi cua » vai cua
di cua » dai cua, doi cua, de 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: thuoc sach v nang x hoi. hieu ((ve pham) OR (vi pham)) duc van dinh ((vi cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang x hoi. hieu ((ve pham) OR (vi pham)) duc van dinh ((vi cua) or (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach v nang x hoi. hieu ((ve pham) OR (vi pham)) duc van dinh ((vi cua) or (di cua)) tre*.