Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi van cong snippets" » "doi van dong snippets", "doi van phong snippets", "doi phan cong snippets", "do van cong snippets", "doi va cong snippets", "doi ban cong snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("doi van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi van cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi van cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.