Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
luoc can » luc canh, hoc can, luoc dai
nang ma » tang ma, sang ma, nang cao
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
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 san ky nang ma hoi. ((hieu van) OR (lieu va)) 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 nang ma hoi. ((hieu van) OR (lieu va)) cac ((duc van) OR (luoc can)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky nang ma hoi. ((hieu van) OR (lieu va)) cac ((duc van) or (luoc can)) hanh vi cua tre*".