Perhaps you should try some spelling variations:
"dung kinh do snippets" » "duong kinh do snippets", "dong kinh do snippets", "dung ninh do snippets", "dung kinh co snippets", "dung trinh do snippets", "dung kinh hoc snippets"
"dung java java snippets" » "dung va java 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 kinh do snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung kinh do snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung kinh do snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung kinh do snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.