Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
ty nang » ky nang, ty xang, ty hang
ly hang » ly quang
van cac » van hac, van cau, van bac
duc van » duc tan, duc manh, duc phan
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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: toc sach ((ty nang) OR (ly hang)) xa hoi. hieu van cac ((duc van) OR (duc va)) thanh vi cua cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) or (ly hang)) xa hoi. hieu van cac ((duc van) OR (duc va)) thanh vi cua cu~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) or (ly hang)) xa hoi. hieu van cac ((duc van) OR (duc va)) thanh vi cua cu*.