Perhaps you should try some spelling variations:
"cong vang do snippets" » "cong lang do snippets", "cong quang do snippets", "cong ngang do snippets", "cong dang do snippets", "cong van do snippets", "cong vang de snippets"
"dung ung java snippets" » "dung trung java snippets", "dung quang java snippets", "dung chung java snippets", "dung using java snippets", "dung ngu java snippets", "dung ung va 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 ung java snippets") or ("cong vang do snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung ung java snippets") OR ("cong vang do snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung ung java snippets ) or ( cong vang do snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung ung java snippets") or ("cong vang do snippets"))) or ("locating bug code snippets"))*.