Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java code slippers"
"con khoa code snippets" » "con khoa cong snippets", "con khoa co snippets", "con khoa de snippets", "von khoa code snippets", "toan khoa code snippets", "cuu khoa code snippets", "con khoa code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs 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 snippets") or ("con khoa code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("con khoa code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( con khoa code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("con khoa code snippets"))) or ("locating bug code snippets"))*.