Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hang xa » hoang xa, hang va, hang ca
hieu vu » hieu va, hieu su, dieu vu
hieu ve » hieu va, hieu van
soc van » hoc van, oc van, sac van
cua tre » cua te, cuu tre, cua triet
y hang » ly hang, ty hang, yu hang
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y hang xa hoi. ((((hieu vu) or (hieu ve))) or (lieu va)) cham soc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y hang xa hoi. ((((hieu vu) OR (hieu ve))) OR (lieu va)) cham soc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y hang xa hoi. ((((hieu vu) or (hieu ve))) or (lieu va)) cham soc van hanh vi cua tre*.