Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
han tai » hang tai, nhan tai, van tai
ve chat » va chat, van chat
ve cham » va cham, vu cham, ve chim
sach v » sach va, sach y, sach 2
luc va » duc va, tuc va, loc va
va han » va phan, van han, va hanh
v nang » va nang, vu nang, van nang
tai va » thai va, mai va, tri va
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi
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 ((x hoi) OR (o hoi)). hieu ((ve cham) or (ve chat)) luc va han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang ((x hoi) OR (o hoi)). hieu ((ve cham) OR (ve chat)) luc va han tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v nang ((x hoi) OR (o hoi)). hieu ((ve cham) or (ve chat)) luc va han tai va thiet".
• Adding a wildcard symbol may retrieve word variants: so sach v nang ((x hoi) OR (o hoi)). hieu ((ve cham) or (ve chat)) luc va han tai va thiet*.