Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, nang ma, mang xa
va hanh » van hanh, va thanh, va danh
lang xa » lang ha, dang xay, lang van
tang ma » mang may, tang van
cac xuc » cam xuc, cac nuoc, chat xuc
vi cua » vai cua, di cua
xuc va » duc va, tuc va, luc va
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 xa) or (lang xa))) or (tang ma)) hoi. hieu vien cac xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((((nang xa) OR (lang xa))) OR (tang ma)) hoi. hieu vien cac xuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((((nang xa) or (lang xa))) or (tang ma)) hoi. hieu vien cac xuc va hanh vi cua tre*.