Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham sac » cham soc, pham sach, cap sac
hieu vu » hieu va, hieu ve, hieu su
hanh di » hanh vi, hanh de, hang di
sac van » cac van, san van, sat van
vu cham » va cham, vu kham, tu cham
su sach » vu sach
ty lang » tay lang, ty hang, tu lang
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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: ((su sach) OR (so sach)) ((ty lang) OR (ty xang)) xa hoi. hieu vu cham sac van hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ((ty lang) or (ty xang)) xa hoi. hieu vu cham sac van hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ((ty lang) or (ty xang)) xa hoi. hieu vu cham sac van hanh di cua tre*.