Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
cua tre » cua te, cuu tre, cua triet
hoc can » hoc dan, hoc cao, hoc phan
vai cua » dai cua, hai cua, lai cua
hoc cac » hoc cao
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
te sac » te sach, te cac, 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 ky sang ma hoa. hieu ve cac ((duc van) or (((hoc can) OR (hoc cac)))) hanh vai cua tre~.
• 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) OR (hoc cac)))) hanh vai 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 (((hoc can) OR (hoc cac)))) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky sang ma hoa. hieu ve cac ((duc van) or (((hoc can) OR (hoc cac)))) hanh vai cua tre*.