Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ve pham » vi pham, v pham, ve phat
ve phan » va phan, ke phan, ve phat
va hanh » van hanh, va thanh, va danh
va chua » vua chua, ca chua, va chu
va cua » via cua, ca cua, ma 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 ky nang x hoi. hieu ((ve pham) OR (ve phan)) duc va hanh ((va cua) or (va chua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang x hoi. hieu ((ve pham) OR (ve phan)) duc va hanh ((va cua) OR (va chua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang x hoi. hieu ((ve pham) OR (ve phan)) duc va hanh ((va cua) or (va chua)) te".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x hoi. hieu ((ve pham) OR (ve phan)) duc va hanh ((va cua) or (va chua)) te*.