Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cach » vien bach, vien cac, nhan cach
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cach tu » cach thuc
dao dai » dat dai, dao dan, tao dai
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo
tu ca » tu cac, tu cua, tu can

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 nang ((x ho) or (xa hoi)). thieu nien cach tu ca dao dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x ho) OR (xa hoi)). thieu nien cach tu ca dao dai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x ho) or (xa hoi)). thieu nien cach tu ca dao dai cuu tre*.