Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
luc van » luoc van, luu van, duc van
xuc van » duc van, xuc ban, thuc van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, 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: tu sac ky nang ma hoi. ((hieu ve) or (hieu van)) cham ((xuc van) OR (luc van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. ((hieu ve) OR (hieu van)) cham ((xuc van) OR (luc van)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ma hoi. ((hieu ve) or (hieu van)) cham ((xuc van) OR (luc van)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. ((hieu ve) or (hieu van)) cham ((xuc van) OR (luc van)) hanh vi cua tre*.