Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
v nang » va nang, vu nang, van nang
soc va » hoc va, loc va, doc va

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) OR (su sach)) v nang xa hoi. hieu van cham soc va ((hanh vai) OR (hanh tai)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (su sach)) v nang xa hoi. hieu van cham soc va ((hanh vai) OR (hanh tai)) cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (su sach)) v nang xa hoi. hieu van cham soc va ((hanh vai) OR (hanh tai)) cua viet*.