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