What happens if one cannot say a word in Teochew?

If one is learning Teochew, there will be words which one have not heard before and then what should one do?

For example, one may not have heard rong5 before as in gho5rong5 for goose down.

Then one would then use an online Teochew dictionary such as czyzd so one can hear the sound of gho5rong5. I have created the link for you so you can go to the webpage and hear how to say rong5. So go and click on the link and learn how to say rong5. 

gho5rong5 鵝絨｜鹅绒

goose down

e2rong2 鵝絨｜鹅绒