Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
so sach » so sanh, bo sach, co sach
han tai » hang tai, nhan tai, van tai
ve chat » va chat, van chat
va cham » va chat, va tham
xuc va » duc va, tuc va, luc va
va han » va phan, van han, va hanh
v nang » va nang, vu nang, voi nang
tai va » thai va, mai va, tri va
x hoi » xa hoi, o hoi, x ho
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((v nang) OR (van nang)) x hoi. hieu ((va cham) or (ve chat)) xuc va han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((v nang) OR (van nang)) x hoi. hieu ((va cham) OR (ve chat)) xuc va han tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((v nang) OR (van nang)) x hoi. hieu ((va cham) or (ve chat)) xuc va han tai va thiet".
• Adding a wildcard symbol may retrieve word variants: so sach ((v nang) OR (van nang)) x hoi. hieu ((va cham) or (ve chat)) xuc va han tai va thiet*.