Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc van php slippers" » "duc va php slippers", "duc tan php slippers", "duc manh php slippers", "duc van phap slippers", "duc van phu slippers", "duc van phan slippers", "duc van php slippery", "duc van php grippers"
"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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("duc van php slippers") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc van php slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc van php slippers ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc van php slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.