Why does "AND" operator results differ when writing it in different style in IBM Watson Discovery

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When I run below queries on Watson Discovery News (English) collection

I am getting different results for

text:Google,text:IBM

screenshot of query and result count for above query

and

text:Google,IBM

screenshot of query and result count for above query

Reference AND operator

What is the difference between those queries ?

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chughts On

My reading of the documentation suggests that

text:Google,IBM : Fetches documents where the text includes 'Google' and 'IBM'

text:Google,text:IBM : Fetches documents where the text includes 'Google' and 'text:IBM'