Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cuu tre » cau tren, cau treo
cac xuc » cam xuc, cac nuoc, chat xuc
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cua triet, dua tren
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, xuc ban
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
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: tu cai ky ((nang xa) OR (nang x)) hoi. hieu ve cac xuc van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky ((nang xa) OR (nang x)) hoi. hieu ve cac xuc van hanh vi ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky ((nang xa) OR (nang x)) hoi. hieu ve cac xuc van hanh vi ((cua tre) or (cuu tre))*".