Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lieu hoc don snippets" » "lieu khoa don snippets", "li hoc don snippets", "lieu hoc dong snippets", "lieu hoc dan snippets", "lieu hoc do 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: (((("lieu hoc don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lieu hoc don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lieu hoc don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lieu hoc don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.