Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
hieu hien » bieu hien, dieu hien, chieu chien
van thanh » ban thanh, van tuan
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky

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 tieng) or (hieu hien)) ((cac tuc) or (cac toc)) van thanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang x ho. ((hieu tieng) OR (hieu hien)) ((cac tuc) OR (cac toc)) van thanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang x ho. ((hieu tieng) or (hieu hien)) ((cac tuc) or (cac toc)) van thanh dai cua triet*.