Perhaps you should try some spelling variations:
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
duc van » duc tan, duc manh, duc phan
hoc can » hoc dan, hoc cao, hoc cac
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
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 sac ky sang ma hoa. hieu ve cac ((((duc van) OR (duc va))) OR (hoc can)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky sang ma hoa. hieu ve cac ((((duc van) OR (duc va))) or (hoc can)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sac ky sang ma hoa. hieu ve cac ((((duc van) OR (duc va))) or (hoc can)) hanh vi cua tre*.