Perhaps you should try some spelling variations:
"phan che cong snippets" » "phan che code snippets", "han che cong snippets", "phap che cong snippets", "phan thi cong snippets", "phan cho cong snippets", "phan chi cong snippets", "phan he cong 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: (((("phan che cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan che cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( phan che cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan che cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.