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

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) OR (te cac)) ky sang tao hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky sang tao hoi. hieu ve cac ((duc van) OR (luoc can)) hanh vi 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 ve cac ((duc van) or (luoc can)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te cac)) ky sang tao hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi cua tre*.