Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi khoa hoc snippets" » "noi khoa hoc snippets", "hoi khoa hoc snippets", "dai khoa hoc snippets", "doi hoa hoc 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 khoa hoc 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 khoa hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi khoa hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi khoa hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.