Perhaps you should try some spelling variations:
sang tao » hang tai
cua tre » cua te, cuu tre, cua triet
hanh di » hanh vi, hanh de, hang di
hoc can » hoc dan, hoc cao, hoc cac
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang
te cac » tu cac, ve cac, te cao
di cua » dai cua, doi cua, de cua
te sac » te sach, te san

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 sac) OR (te cac)) ky sang tao hoi. hieu va cac ((duc van) OR (hoc can)) hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te cac)) ky sang tao hoi. hieu va cac ((duc van) or (hoc can)) hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te cac)) ky sang tao hoi. hieu va cac ((duc van) or (hoc can)) hanh di cua tre*.