Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
ve cham » va cham, vu cham, ve chim
ve chat » va chat, van chat
van tai » von tai, van tuan
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
xuc va » duc va, tuc va, luc va
tai va » thai va, mai va, tri va
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 y nang ((ma hoi) or (ma hoa)). hieu ((ve cham) or (ve chat)) xuc va van tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((ma hoi) OR (ma hoa)). hieu ((ve cham) OR (ve chat)) xuc va van tai va thiet.
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((ma hoi) or (ma hoa)). hieu ((ve cham) or (ve chat)) xuc va van tai va thiet*.