Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
hieu vien » hieu viec, thieu nien, nhieu viec
hieu hien » bieu hien, dieu hien, chieu chien
hanh dai » hanh tai, hanh dao, vanh dai
cua viet » ca viet, hoa viet, cua vat
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 (hieu hien)) cac tuc va hanh dai cua viet~.
• 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 (hieu hien)) cac tuc va hanh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang x ho. ((((hieu vien) or (hieu tieng))) or (hieu hien)) cac tuc va hanh dai cua viet*.