Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"luc duc cong snippets" » "luc duc code snippets", "luc duc cuong snippets", "luc dung cong snippets", "luc nuoc cong snippets", "luc du cong snippets", "luu duc cong snippets", "luc dich cong snippets"
"python using java snippets" » "python using data 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: (((("luc duc cong snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luc duc cong snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( luc duc cong snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luc duc cong snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.