Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu vien » hieu viec, thieu nien, hieu tieng
hieu hien » bieu hien, dieu hien, chieu chien
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
tu van » tu va
cac tu » cac thu, cach tu, cac du

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. ((hieu vien) or (hieu hien)) cac tu van thanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu vien) OR (hieu hien)) cac tu van thanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu vien) or (hieu hien)) cac tu van thanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu vien) or (hieu hien)) cac tu van thanh vi ((cua tre) OR (cuu tre))*.