Perhaps you should try some spelling variations:
hieu vien » hieu viec, thieu nien, hieu tieng
hieu hien » bieu hien, dieu hien, chieu chien
cua triet » cua viet, su triet, va triet
lanh dai » lanh dao, lanh hai, lang dai
cac tuc » cac toc, cac tu, cac tac
va lanh » va lang, va danh, va hanh
can ky » dan ky, ban ky, tan ky
tuc va » thuc va, truc va, tuc xa

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 vien) or (hieu hien)) cac tuc va lanh dai 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 vien) OR (hieu hien)) cac tuc va lanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((can ky) OR (van ky)) nang x ho. ((hieu vien) or (hieu hien)) cac tuc va lanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) OR (van ky)) nang x ho. ((hieu vien) or (hieu hien)) cac tuc va lanh dai cua triet*.