Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va danh » va dinh, va dan, va hanh
lai cua » dai cua, hai cua, thai cua
x hoi » xa hoi, o hoi, x ho

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang x hoi. hieu ve pham duc va danh ((lai cua) OR (lai chau)) te~".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang x hoi. hieu ve pham duc va danh ((lai cua) OR (lai chau)) te*.