Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi duy dong snippets" » "doi huy dong snippets", "doi duc dong snippets", "doi duy dung snippets", "do duy dong snippets", "doi day dong snippets", "doi quy dong 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 duy dong 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 duy dong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi duy dong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi duy dong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.