The spelling of the word "boerma" can be a bit tricky due to the presence of two vowels that make a diphthong sound. In IPA phonetic transcription, the word is spelled as /ˈbʊərmɑː/. The symbol /ə/ represents the schwa sound which sounds like a weak 'uh' and occurs in the second syllable. The combination of the vowels 'o' and 'e' creates the /oʊ/ sound which is often used in American English. Overall, the pronunciation of "boerma" can be a bit challenging due to its unique combination of vowels.