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 va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
te sai » te tai, te bai, te lai
sai ky » sac 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.

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