Perhaps you should try some spelling variations:
"h. agent based government services" » "h. agent based government securities", "h. agent gases government services", "h. agent dated government services", "h. agent faced government services"
"h. forest based investment period" » "h. forest based investment series", "h. forest based investment policy", "h. forest based adjustment period", "h. forest fixed investment period", "h. forest best investment period", "h. forest bond investment period", "h. forest area investment period"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("h. agent based government services") OR ("h. forest based investment period"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"h. agent based government services\") OR (\"h. forest based investment period\"))".
• Removing quotes may allow a broader search: (( h. agent based government services ) OR ( h. forest based investment period )).
• Adding a wildcard symbol may retrieve word variants: (("h. agent based government services") OR ("h. forest based investment period"))*.