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

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) OR (cac du)) van thanh vi 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) OR (cac du)) van thanh vi 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) OR (cac du)) van thanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu vien) or (hieu hien)) ((cac tu) OR (cac du)) van thanh vi cuu tre*.