Perhaps you should try some spelling variations:
van triet » va triet, van thiet, van trieu
su sach » so sach, vu sach
ky lang » ky dang, ky tang, tay lang
qua hau » qua hai, qua bau, qua dau
hau loc » huu loc, phau hoc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
loc va » hoc va, luc va

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 lang) OR (ky nang)) xa hoi. hieu qua hau loc va danh vi van triet~.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) or (ky nang)) xa hoi. hieu qua hau loc va danh vi van triet*.