Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cua viet » hoa viet, cua vat, cua dieu
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
van cham » van chat, van tham, va cham
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
ca viet » va viet, co viet, hoa viet
soc va » hoc va, loc va, doc va
y nang » ky nang, ly nang, v 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 (vu sach)) y nang xa hoi. hieu van cham soc va thanh vi ((cua viet) OR (ca viet))~.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (vu sach)) y nang xa hoi. hieu van cham soc va thanh vi ((cua viet) or (ca viet))*.