Perhaps you should try some spelling variations:
"heavy smoking" » "health smoking", "heavy smokers", "heavy doping"
"heavy smoker" » "heavy smokers", "heavy snorers"
"heavy sons" » "heavy ions", "heavy mesons"
"heavy sour" » "heavy hour", "heavy hours"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"heavy sons\") OR (((\"heavy sour\") OR (((\"heavy smoker\") OR (\"heavy smoking\"))))))".
• Removing quotes may allow a broader search: (( heavy sons ) OR ((( heavy sour ) OR ((( heavy smoker ) OR ( heavy smoking )))))).
• Adding a wildcard symbol may retrieve word variants: (("heavy sons") OR ((("heavy sour") OR ((("heavy smoker") OR ("heavy smoking"))))))*.