Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
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 va, duc tan, duc manh
hoc can » hoc dan, hoc cao, hoc cac
cua tre » cua te, cuu tre, dua tren
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac, vien 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 sac ky sang ma hoa. hieu ve cac ((duc van) OR (hoc can)) hanh vi ((cua tre) OR (cua triet))~.
• 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 (hoc can)) hanh vi ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: te sac ky sang ma hoa. hieu ve cac ((duc van) or (hoc can)) hanh vi ((cua tre) OR (cua triet))*.