Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cach » vien bach, vien cac, nhan cach
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cach tu » cach thuc
dao dan » dao van, cao dang, dao dong
dan cuu » dan cu, dan cua, dan luu
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: so sach ky nang ((x ho) or (xa hoi)). thieu nien cach tu ca dao dan cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((x ho) OR (xa hoi)). thieu nien cach tu ca dao dan cuu tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((x ho) or (xa hoi)). thieu nien cach tu ca dao dan cuu tre*.