Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"doi duc hoan snippets" » "doi duc code snippets", "doi duc hoang snippets", "doi duc hoa snippets", "doi duc toan snippets", "do duc hoan snippets", "doi duy hoan snippets", "oi duc hoan 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: (((("doi duc hoan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi duc hoan snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( doi duc hoan snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi duc hoan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.