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