Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tuan » van quan, van ban, anh tuan
ty nang » ky nang, ty xang, ty hang
ly hang » ly quang
hieu ve » hieu va, hieu van
tuan vi » quan vi, luan vi, quans vi
ve cac » va cac, vien cac
du van » duy van, duc van, tu van
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 ve cac du van tuan vi cua cu~.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) or (ly hang)) xa hoi. hieu ve cac du van tuan vi cua cu*.