Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
ve ban » te ban, va ban, ve bao
ve bac » ve bao, ve cac, he bac
bao va » bao ve, tao va, ban va
di cua » dai cua, doi cua, de cua
bo va » do va, so va, co va
x hoi » xa hoi, o hoi, x ho

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 sach ky nang x hoi. hieu ((ve bac) OR (ve ban)) ((bo va) OR (bao va)) hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ((ve bac) or (ve ban)) ((bo va) OR (bao va)) hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((ve bac) or (ve ban)) ((bo va) OR (bao va)) hanh di cua tre*.