Perhaps you should try some spelling variations:
"dung len choi snippets" » "dung len code snippets", "dung nen choi snippets", "dung le choi snippets", "dung luan choi snippets", "dung len thoi snippets", "dung len troi snippets", "dung ben chi 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 len 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 len choi snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung len choi snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung len choi snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.