Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
hieu su » hieu sau, tieu su, hieu so
su kham » su pham, vu kham, so kham
soc van » hoc van, sac van, soc dan
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
oc van » hoc van, luoc van, quoc van
anh vi » anh va, anh ve, anh vu

You may be able to get more results by adjusting your search query.

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