Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
co sach » bo sach, cuon sach, hoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
ve phan » ke phan, ve phat, vi phan
va phan » van phan, va phat, va phap
van cua » vang cua, dan cua, nan cua
ban cua » ban quan

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

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