Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
so sac » so sach, so dac
sac ky » cac ky, sai ky
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, duc va
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: so sac ky dang xa hoi. hieu van cam ((xuc va) or (((tuc va) OR (tuc xa)))) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky dang xa hoi. hieu van cam ((xuc va) OR (((tuc va) OR (tuc xa)))) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky dang xa hoi. hieu van cam ((xuc va) or (((tuc va) OR (tuc xa)))) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sac ky dang xa hoi. hieu van cam ((xuc va) or (((tuc va) OR (tuc xa)))) hanh vi cua tre*.