Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"using java code slippers" » "using data code slippers"
"van cong code snippets" » "van cong cong snippets", "van cong co snippets", "van cong che snippets", "van dong code snippets", "van phong code snippets", "phan cong code snippets"

Try widening your search to All Fields.

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 ("van cong code snippets"))) or ("locating bugs code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code slippers") OR ("van cong code snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( using java code slippers ) or ( van cong code snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code slippers") or ("van cong code snippets"))) or ("locating bugs code snippets"))*.