Perhaps you should try some spelling variations:
vat doanh » van doanh, vay doanh, luat doanh
thu sach » tu sach, thuat sach, thuoc sach
cam thuc » am thuc, nam thuc, cam thu
va doanh » van doanh, vay doanh, va danh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
ve cam » ve cham, ve cac, va cam
van ca » van cau, van cua, dan ca
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. hieu ve cam thuc ((vat doanh) OR (va doanh)) van ca viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ve cam thuc ((vat doanh) OR (va doanh)) van ca viet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ve cam thuc ((vat doanh) OR (va doanh)) van ca viet*.