Perhaps you should try some spelling variations:
thieu nien » thien nhien
thu sach » tu sach, thuat sach, thuoc sach
nang xa » nang x, lang xa, nang ma
cac don » cac dan, cac doanh, cac cong
cua tre » cuu tre, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
cac mon » cac cong
van anh » van thanh, tuan anh, van minh
anh via » anh va, anh bia, anh viet
cua te » cua tu

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 ky nang xa hoi. thieu nien ((cac don) OR (cac mon)) van anh via ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. thieu nien ((cac don) OR (cac mon)) van anh via ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. thieu nien ((cac don) OR (cac mon)) van anh via ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. thieu nien ((cac don) OR (cac mon)) van anh via ((cua tre) or (cua te))*.