Perhaps you should try some spelling variations:
hieu sau » hieu suat, tieu su, hieu va
soc van » hoc van, sac van, soc dan
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu su » tieu su, hieu so, hieu suat
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
oc van » hoc van, luoc van, quoc van
anh vi » hanh vi, anh va, anh ve
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: tu sach ky nang xa hoi. ((hieu su) OR (hieu sau)) kham ((soc van) or (oc van)) anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu su) OR (hieu sau)) kham ((soc van) OR (oc van)) anh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu su) OR (hieu sau)) kham ((soc van) or (oc van)) anh vi cua tre*".