Perhaps you should try some spelling variations:
"h. test foreign investment services" » "h. test foreign government services", "h. test foreign treatment services", "h. test foreign investment choices", "h. net foreign investment services", "h. debt foreign investment services", "h. des foreign investment services"
"h. heat water investment series" » "h. heat water investment barriers", "h. heat water investment treaties", "h. heat water investment schemes", "h. heat water investments series", "h. heat after investment series", "h. heat rates investment series", "h. peat water investment series", "h. cheap water investment series", "h. heavy water investment series"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"h. test foreign investment services\") OR (\"h. heat water investment series\"))~".
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