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

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

I am getting different results for

text:Google,text:IBM

上述查询的查询和结果计数的屏幕截图

and

text:Google,IBM

上述查询的查询和结果计数的屏幕截图

Reference AND operator

What is the difference between those queries ?

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'

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