Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
qua tham » qua cham, qua than, qua thanh
tham soc » cham soc, tham nuoc, thai son
ban hanh » ban hang
ky dang » ky nang, ky danh
dang ha » dong ha, dung ha, lang ha
soc ban » hoc ban, coc ban, so ban
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, te cao, de cac
ve cac » va cac
ha hoi » hoa hoi, ha noi, xa hoi
vi cua » vai cua, di 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: ((te cac) OR (((ve cac) OR (vien cac)))) ky dang ha hoi. hieu qua tham soc ban hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) or (((ve cac) OR (vien cac)))) ky dang ha hoi. hieu qua tham soc ban hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te cac) or (((ve cac) OR (vien cac)))) ky dang ha hoi. hieu qua tham soc ban hanh vi cua tre*.