Perhaps you should try some spelling variations:
luoc can » luc canh, hoc can, luoc dai
duc manh » suc manh, duc anh, duc minh
cua tre » cua te, cuu tre, cua triet
ky sang » ky dang, ky tang, duy sang
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
te sac » te sach, te cac, te san
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac

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) or (ky nang)) ma hoi. hieu ve cac ((duc manh) or (luoc can)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky sang) OR (ky nang)) ma hoi. hieu ve cac ((duc manh) OR (luoc can)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ((ky sang) or (ky nang)) ma hoi. hieu ve cac ((duc manh) or (luoc can)) hanh vi cua tre*.