Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"van tan cua snippets" » "van tuan cua snippets", "van ban cua snippets", "van tai cua snippets", "van than cua snippets", "van tang cua snippets", "van toan cua 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: (((("van tan cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van tan cua snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tan cua snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tan cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.