Using IF Search Function in Mail Merge

Hello, I am new to the the forum so hello to all!

I was wondering if someone can please help me;

I have created a mail merge from excel into a word email message and have added an IF function to the merge-field using the "Rules" tab.

I am using the "IF" function but rather than have it insert the additional text if the merge-field is "equal to" I would like to be able to add the text or for it to "trigger" if the merge-field contains a certain word or phrase.

This is because I have two different possible insertions depending on the merge field but would like a third option where if the merge-field contains both "chosen words or phrases then it will show both the additional inserted text (without creating a third option)

i have tried adding "SEARCH" but without success.

i hope I have explained this clearly and not put anyone to sleep!

I would really appreciate it some one could help me with this.

thank you very much in advance.

Alfred.