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