Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cac bac » cac bai, cac ban, cac cach
cuu tre » cua tre, cau tren, cau treo
va dan » ca dan, va dau, va dap
va dao » ca dao
vi cuu » vi luu, vinh cuu
x hoi » xa hoi, o hoi, x ho

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

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