Perhaps you should try some spelling variations:
sach kem » hanh kem
sach ky » sach y, sach ty, sach hay
va hanh » van hanh, va thanh, va danh
bac bao » bac bo, tac bao, bac cao
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve bac » ve bao, ve cac, ve ban
bao va » bao ve, tao va, ban va
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((((sach ky) or (sach kem))) or (sac ky)) nang x hoi. hieu ve bac bao va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ky) OR (sach kem))) OR (sac ky)) nang x hoi. hieu ve bac bao va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((((sach ky) or (sach kem))) or (sac ky)) nang x hoi. hieu ve bac bao va hanh vi cua tre*.