problem in biopython code

[precious7]

Hello to everyone,
I'm novice in biopython and I've a problem in my code I don't know why. When I try to look for a nutrient with its name it works. But, when I put nutrientsin a list for a sequential search it does not work. This is my code below:

for line in nFile:
    file.append(line)

for elt in file:
    Entrez.email = "[email protected]"
    handle = Entrez.egquery(term="orchid")
    record = Entrez.read(handle)
    handle = Entrez.esearch(db="pubmed", term="orchid[Orgn] AND elt[nutrient]", retmax=5)    
    record = Entrez.read(handle)
    idlist = record["IdList"]
    handle = Entrez.efetch(db="pubmed", id=idlist, rettype="medline", retmode="text")   
    records = Medline.parse(handle)   
    records = list(records)                     
    for record in records:                      
        print("Title:", record.get("TI", "?"))

I have for example differents results for calcium[nutrient] and elt[nutrient] where elt = calcium for my first test.
So, I need your help please