Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"qua khoa de snippets" » "sua khoa de snippets", "qua kho de snippets", "chua khoa de snippets", "qua khoa dr snippets", "qua khoa he snippets", "qua khoi de snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("qua khoa de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("qua khoa de snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( qua khoa de snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("qua khoa de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.