Here's a breakdown:
* Thī: The "th" sound is like the "th" in "thin"
* ə: The "ə" is the schwa sound, like the "a" in "about"
* tī: The "i" is a long "i" sound, like the "i" in "time"
* rə: The "ə" is again the schwa sound
Let me know if you'd like to hear how it's pronounced!