Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cong vinh doi snippets" » "cong trinh doi snippets", "trong vinh doi snippets", "cong viec doi snippets", "cong tinh doi snippets", "cong vong doi 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 ("cong vinh doi snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("cong vinh doi snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( cong vinh doi snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("cong vinh doi snippets"))) or ("locating bug code snippets"))*.