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

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 hoc va hanh vai ((cua viet) OR (hoa 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 hoc va hanh vai ((cua viet) OR (hoa viet))~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (su sach)) v nang xa hoi. hieu van cham hoc va hanh vai ((cua viet) OR (hoa viet))*.