Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
hieu vien » hieu hien, hieu viec, thieu nien
dieu hien » dieu khien, dieu kien, bieu hien
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan 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 san ky nang x ho. ((((hieu vien) or (hieu tieng))) or (dieu hien)) cac tuc va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang x ho. ((((hieu vien) OR (hieu tieng))) OR (dieu hien)) cac tuc va hanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang x ho. ((((hieu vien) or (hieu tieng))) or (dieu hien)) cac tuc va hanh dai cua triet*.