Perhaps you should try some spelling variations:
van cham » van chat, van tham, va cham
cua viet » hoa viet, cua vat, cua dieu
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
su sach » so sach, vu sach
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: ((te sach) OR (su sach)) y nang mai hoi. hieu van cham soc va hanh di ((cua viet) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) y nang mai hoi. hieu van cham soc va hanh di ((cua viet) OR (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) y nang mai hoi. hieu van cham soc va hanh di ((cua viet) OR (ca viet))*.