Perhaps you should try some spelling variations:
luoc can » luc canh, hoc can, luoc dai
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
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 sac ky tang ma hoi. 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 sac ky tang ma hoi. hieu ve cac ((duc van) OR (luoc can)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky tang ma hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi cua tre*.