Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
bieu hien » dieu hien, dieu khien, bien phien
cua triet » cua viet, su triet, va triet
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
cac tuc » cac toc, cac tu, cac tac
dao cua » dai cua, day cua, dan cua
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 (bieu hien)) cac tuc ((van hanh) OR (ban hanh)) dao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang x ho. ((hieu tieng) OR (bieu hien)) cac tuc ((van hanh) OR (ban hanh)) dao cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang x ho. ((hieu tieng) or (bieu hien)) cac tuc ((van hanh) OR (ban hanh)) dao cua triet".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang x ho. ((hieu tieng) or (bieu hien)) cac tuc ((van hanh) OR (ban hanh)) dao cua triet*.