Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, nuoc sach
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
ly hang » ly quang
ty nang » ky nang, ty xang, ty hang
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) OR (thuoc sach)) ((ty nang) OR (ly hang)) xa hoi. hieu van cac duc van thanh vi cua cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ((ty nang) or (ly hang)) xa hoi. hieu van cac duc van thanh vi cua cu~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ((ty nang) or (ly hang)) xa hoi. hieu van cac duc van thanh vi cua cu*.