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