Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
ve cai » va cai, ve cac, ve tai
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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 lang xa hoi. hieu ((ve cai) or (va cac)) duc va hanh ((vi cua) OR (di cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu ((ve cai) OR (va cac)) duc va hanh ((vi cua) OR (di cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. hieu ((ve cai) or (va cac)) duc va hanh ((vi cua) OR (di cua)) triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. hieu ((ve cai) or (va cac)) duc va hanh ((vi cua) OR (di cua)) triet*.