The spelling of the word "Thulia" can be explained through IPA phonetic transcription. The initial "th" sound is represented by the symbol /θ/. The letter "u" is pronounced as /u/, and the letter "l" is pronounced as /l/. The final sound, represented by the letter "i", is pronounced as /iː/. The overall pronunciation of "Thulia" can be written as /ˈθuːliə/. The spelling of this word may be challenging for some, but it is important to remember the phonetic sounds to assist with proper pronunciation.