Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pho hoc don snippets" » "phoi hoc don snippets", "cho hoc don snippets", "pho ho don snippets", "pho hoc dong snippets", "pho hoc dan snippets", "pho 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: (((("pho 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: (((("pho hoc don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pho hoc don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pho hoc don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.