Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
dan doan » dan toan, tan doan, van doan
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
va nam » van nam, ha nam, va nay
he nam » ha nam, nghe nam
van ca » van cua, dan ca, van ha
x hoi » xa hoi, o hoi, x ho

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: su sach ky nang x hoi. hieu ((va nam) OR (he nam)) thuc dan doan ((van ca) OR (van cau)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((va nam) or (he nam)) thuc dan doan ((van ca) OR (van cau)) viet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((va nam) or (he nam)) thuc dan doan ((van ca) OR (van cau)) viet*.