Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
phan duc » pham duc, phan tu, phan dau
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky nang x ho. hieu ve phan duc va doanh van ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky nang x ho. hieu ve phan duc va doanh van ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: co sach ky nang x ho. hieu ve phan duc va doanh van ((cua te) or (cua tu))*.