Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, hieu ve
ban benh » san benh, ban banh, can benh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ba benh » va benh, bo benh, bach benh
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu 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: thu sach ky nang xa hoi. ((hieu van) OR (lieu va)) cam xuc ((ban benh) OR (ba benh)) de cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((hieu van) OR (lieu va)) cam xuc ((ban benh) or (ba benh)) de cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu van) OR (lieu va)) cam xuc ((ban benh) or (ba benh)) de cua tre*.