Perhaps you should try some spelling variations:
"dung lap doan snippets" » "dung lap code snippets", "dung lam doan snippets", "dung lai doan snippets", "dung lao doan snippets", "dung lap doanh snippets", "dung tap doan snippets", "dung lap dan snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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 lap doan snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung lap doan snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung lap doan snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung lap doan snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.