Perhaps you should try some spelling variations:
qua tham » qua cham, qua than, qua thanh
hoc ban » hoc bang, hoc dan, hoc bai
soc ban » coc ban, so ban, soc ba
cua tre » cua te, cuu tre, cua triet
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
ha hoi » hoa hoi, ha noi, xa hoi
ve cac » va cac, vien cac
vi cua » vai cua, di cua
te cac » tu cac, te cao, de cac

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)) ky dang ha hoi. hieu qua tham ((soc ban) OR (hoc ban)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) or (ve cac)) ky dang ha hoi. hieu qua tham ((soc ban) OR (hoc ban)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te cac) or (ve cac)) ky dang ha hoi. hieu qua tham ((soc ban) OR (hoc ban)) hanh vi cua tre*.