Perhaps you should try some spelling variations:
chieu chien » thien chien, hieu hien
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
va hanh » van hanh, va thanh, va danh
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
dac va » duc va, day va, dat 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: ((thu sach) or (su sach)) y nang x hoi. ((hieu vien) or (chieu chien)) cac dac va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) y nang x hoi. ((hieu vien) OR (chieu chien)) cac dac va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) y nang x hoi. ((hieu vien) or (chieu chien)) cac dac va hanh vi cua tre*.