Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
va doanh » van doanh, va danh, hoa doanh
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
y nang » ky nang, ly nang, v nang
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 y nang x ho. hieu ve pham duc ((va doanh) or (vay doanh)) van ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach y nang x ho. hieu ve pham duc ((va doanh) OR (vay doanh)) van ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: co sach y nang x ho. hieu ve pham duc ((va doanh) or (vay doanh)) van ((cua te) or (cua tu))*.