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
cac thuc » cach thuc, cac thu, can thuc
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
hanh dao » lanh dao, thanh dat, thanh dam
dao cua » dai cua, day cua, dan cua
san ky » sang ky, van ky, ban ky
dan ky » van 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) OR (dan ky)) nang x ho. ((hieu tieng) or (bieu hien)) cac thuc van hanh dao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (dan ky)) nang x ho. ((hieu tieng) OR (bieu hien)) cac thuc van hanh dao cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (dan ky)) nang x ho. ((hieu tieng) or (bieu hien)) cac thuc van hanh dao cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (dan ky)) nang x ho. ((hieu tieng) or (bieu hien)) cac thuc van hanh dao cua triet*.