Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"hang cong do snippets" » "dang cong do snippets", "hang nong do snippets", "thanh cong do snippets", "hang cong dot snippets", "hang cuong do snippets", "hang cong so 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: (((("dung java java snippets") or ("hang cong do snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("hang cong do snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( hang cong do snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("hang cong do snippets"))) or ("locating bug code snippets"))*.