Perhaps you should try some spelling variations:
"dung san choi snippets" » "dung san code snippets", "dong san choi snippets", "dung sai choi snippets", "dung luan choi snippets", "dung san chi snippets", "dung san cho snippets", "dung van choi 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 san choi 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 san choi snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung san choi snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung san choi snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.