Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc phan lee snippets" » "hoc phan lee snippets", "duc phan lee snippets", "doc than lee snippets", "doc phan le snippets", "doc han lee snippets", "doc phan liet 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: (((("doc phan lee snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doc phan lee snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc phan lee snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc phan lee snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.