Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
hieu vien » hieu hien, hieu viec, thieu nien
hanh dai » hanh tai, hanh dao, vanh dai
cac tuc » cac toc, cac tac, cac nuoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
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 san ky nang x ho. ((hieu vien) or (bieu hien)) ((cac tuc) OR (cac tu)) va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang x ho. ((hieu vien) OR (bieu hien)) ((cac tuc) OR (cac tu)) va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang x ho. ((hieu vien) or (bieu hien)) ((cac tuc) OR (cac tu)) va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang x ho. ((hieu vien) or (bieu hien)) ((cac tuc) OR (cac tu)) va hanh dai cua tre*.