Perhaps you should try some spelling variations:
"h. dept rates treatment services" » "h. dept rates payment services", "h. dept water treatment services", "h. dept gats treatment services", "h. dept tes treatment services", "h. death rates treatment services", "h. des rates treatment services", "h. heat rates treatment services"
"h. dept rates investment period" » "h. dept rates investment series", "h. dept rates investment policy", "h. dept rates adjustment period", "h. dept notes investment period", "h. dept rules investment period", "h. dept water investment period", "h. death rates investment period", "h. des rates investment period", "h. heat rates investment period"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("h. dept rates investment period") OR ("h. dept rates treatment services"))~.
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