When reciting in Kaddish the words "Le'ela Min Kol Birchata Ve'shirata," one should ensure to recite "Min Kol" as two words, as opposed to "Mi'kol." The "Yeheh Shemeh Rabba" response – which, according to our custom, continues through the word "De'alma" – must consist of 28 words, and if one recites "Mi'kol" instead of "Min Kol," he ends up with only 27 words. Rav Shmuel Vital (1598-1677) held a different view, asserting that the expression "Min Kol" is grammatically incorrect. He thus maintained that the proper text is "Mi'kol," and that the word "Ve'imru" after "Da'amiran Be'alma" counts as the 28th word. The consensus opinion, however, is that the correct text is "Min Kol," as "Ve'imru" cannot count toward the required number of words.
The custom among Ashkenazim is to substitute "Min Kol" with "Mi'kol" during the Aseret Yemeh Teshuba (Ten Days of Repentance), from Rosh Hashanah through Yom Kippur. They do so because their practice is to repeat the word "Le'ela" during this period, resulting in 29 words. The words "Min Kol" are thus replaced with "Mi'kol" to keep the total number at 28. They end up reciting, "Le'ela Le'ela Mi'kol Birchata…" Sepharadim, however, do not follow this custom. According to some Poskim, a Sepharadi who prays in an Ashkenazic Minyan during the Aseret Yemeh Teshuba should follow the Ashkenazic custom and recite "Le'ela Le'ela Mi'kol Birchata."
Toward the end of the "Yeheh Shemeh Rabba" response, we mention the word "Tishbehata." Our custom is to pronounce this word "Tishbehata," and not "Tushbehata."
The word after "Tishbehata" is "Nehemata," which means "consolation." The explanation is that G-d is in mourning, as it were, during the Jewish People's period of exile. He grieves, so-to-speak, over the fact that we lost the Bet Ha'mikdash, were driven from our homeland, and have been dispersed among the other nations. We therefore wish the Almighty "consolation" with the rebuilding of the Bet Ha'mikdash and our return to our land.
Summary: When reciting in Kaddish the words "Le'ela Min Kol Birchata Ve'shirata," one should ensure to recite "Min Kol" as two words, as opposed to "Mi'kol." Ashkenazim have the custom to change this phrase during the Aseret Yemeh Teshuba (reciting "Le'ela Le'ela Mi'kol…"), but this is not the practice among Sepharadim. Our custom is to recite "Tishbehata," and not "Tushbehata."