Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi dan cong snippets" » "doi dang cong snippets", "doi van cong snippets", "doi dan dong snippets", "hoi dan cong snippets", "doi ban cong snippets", "doi dau 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 dan 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 dan cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi dan cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi dan cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.