Perhaps you should try some spelling variations:
luoc can » luc canh, luoc dai, duoc cac
cua tre » cua te, cuu tre, cua triet
hoc can » hoc dan, hoc cao, hoc cac
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ve cac » va cac, vien cac
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
te san » te ban, ke san, tu 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 san ky tang ma hoi. hieu ve cac ((duc van) or (((luoc can) or (hoc can)))) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky tang ma hoi. hieu ve cac ((duc van) OR (((luoc can) OR (hoc can)))) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te san ky tang ma hoi. hieu ve cac ((duc van) or (((luoc can) or (hoc can)))) hanh vi cua tre*.