Below is a proposed solution for the Challenge 66 - Find the Position of Word

Put the following formula and drag down. Let's assume the word "and" in cell D2 -

=LEN(REPLACE(A2,SEARCH(" "&$D$2," "&A2),LEN(A2),""))-LEN(SUBSTITUTE(
REPLACE(A2,SEARCH(" "&$D$2," "&A2),LEN(A2),"")," ",""))+1

You may download the solution workbook - Solution - Challenge 66 - Find the Position of Word