Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
hieu hien » bieu hien, dieu hien, chieu chien
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
dao cua » dai cua, dan cua, do cua
day cua » dai cua
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 tieng) or (hieu hien)) cac tuc va hanh ((dao cua) OR (day cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang x ho. ((hieu tieng) OR (hieu hien)) cac tuc va hanh ((dao cua) OR (day cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang x ho. ((hieu tieng) or (hieu hien)) cac tuc va hanh ((dao cua) OR (day cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang x ho. ((hieu tieng) or (hieu hien)) cac tuc va hanh ((dao cua) OR (day cua)) triet*.