Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
va tinh » may tinh
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
vai cua » dai cua, hai cua, lai cua
sach ky » sac ky, sach y, sach ty
vi cua » di cua
loc va » hoc va, luc va
va cai » va bai, va dai, va cao

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 dang xa hoi. hieu ((va cai) or (va cac)) loc va tinh ((vi cua) or (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang xa hoi. hieu ((va cai) OR (va cac)) loc va tinh ((vi cua) OR (vai cua)) te.
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xa hoi. hieu ((va cai) or (va cac)) loc va tinh ((vi cua) or (vai cua)) te*.