The phrase "best can dos" refers to the best efforts or abilities of someone. The spelling of this phrase is straightforward, with each word being spelled phonetically. "Best" is pronounced /bɛst/, "can" as /kæn/, and "dos" as /dɑz/. The "s" at the end of "dos" indicates that it is a plural form of "do," which means to perform an action. Overall, correct spelling is crucial for clear communication in written language, and phonetic transcription can help learners better understand how words are pronounced.