Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
xuc van » duc van, luc van, vuc van
hieu ve » hieu va
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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) or (sang ma)) hoi. ((hieu ve) OR (hieu van)) cham xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang ma) OR (sang ma)) hoi. ((hieu ve) OR (hieu van)) cham xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang ma) or (sang ma)) hoi. ((hieu ve) OR (hieu van)) cham xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang ma) or (sang ma)) hoi. ((hieu ve) OR (hieu van)) cham xuc van hanh vi cua tre*.