Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cach » vien bach, vien cac, nhan cach
cua triet » cua viet, su triet, va triet
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
cua tre » cua te, cuu tre, dua tren
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 ((cua tre) OR (cua triet))~.
• 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 ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x ho) or (xa hoi)). thieu nien cach tu ca dao dai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x ho) or (xa hoi)). thieu nien cach tu ca dao dai ((cua tre) OR (cua triet))*.