Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
hieu hien » bieu hien, dieu hien, chieu chien
cua triet » cua viet, su triet, va triet
cac thuc » cach thuc, cac thu, can thuc
thuc va » thuc vat, thuc dan, thuc day
va lanh » va lang, va danh, va hanh
dao cua » dai cua, day cua, dan cua
can ky » dan ky, ban ky, tan 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 ((can ky) or (van ky)) nang x ho. ((hieu tieng) or (hieu hien)) cac thuc va lanh dao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((can ky) OR (van ky)) nang x ho. ((hieu tieng) OR (hieu hien)) cac thuc va lanh dao cua triet.
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) or (van ky)) nang x ho. ((hieu tieng) or (hieu hien)) cac thuc va lanh dao cua triet*.