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
ve phan » va phan, ke phan, ve phat
va danh » va dinh, va hanh, dia danh
vai cua » dai cua, hai cua, lai cua
va dan » ca dan, va dao, va dau
cua te » cua tu

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 ty nang x ho. hieu ((ve phan) or (vi pham)) duc ((va danh) OR (va dan)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang x ho. hieu ((ve phan) OR (vi pham)) duc ((va danh) OR (va dan)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang x ho. hieu ((ve phan) or (vi pham)) duc ((va danh) OR (va dan)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang x ho. hieu ((ve phan) or (vi pham)) duc ((va danh) OR (va dan)) vai cua te*.