Perhaps you should try some spelling variations:
"python using java slippers" » "python using data slippers", "python using java grippers"
"php cac dan slippery" » "phap cac dan slippery", "pha cac dan slippery", "phap cach dan slippery"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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: "((((\"php cac dan slippery\") OR (\"python using java slippers\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( php cac dan slippery ) OR ( python using java slippers ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("php cac dan slippery") OR ("python using java slippers"))) OR ("locating bug code snippets"))*.