Perhaps you should try some spelling variations:
luoc van » luoc can, luoc va, luc van
dieu cua » dieu tra
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
oc van » hoc van, quoc van
ve cua » le cua, de cua, te cua

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 vu cham ((oc van) OR (luoc van)) anh ((ve cua) OR (dieu cua)) tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu vu cham ((oc van) OR (luoc van)) anh ((ve cua) or (dieu cua)) tu~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu vu cham ((oc van) OR (luoc van)) anh ((ve cua) or (dieu cua)) tu*.