Perhaps you should try some spelling variations:
"h. heat based treatment services" » "h. heat based payment services", "h. heat seed treatment services", "h. heat cancer treatment services", "h. heat based investment services", "h. health based treatment services", "h. text based treatment services", "h. sat based treatment services"
"h. rent sector investment trends" » "h. rent sector investment funds", "h. rent sector investment treaty", "h. rent sector investment trusts", "h. rented sector investment trends", "h. rental sector investment trends", "h. meat sector investment trends"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("h. rent sector investment trends") OR ("h. heat based treatment services"))~.
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