Perhaps you should try some spelling variations:
"using java code slippers" » "using data code slippers"
"truan doi duc snippets" » "truyen doi duc snippets", "quan doi duc snippets", "khuan doi duc snippets", "truan do duc snippets", "truan doi duy snippets", "truan oi duc snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

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

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