Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc ngu con snippets" » "hoc nga con snippets", "hoc nguoi con snippets", "hoc nghe con snippets", "hoc ngu co snippets", "hoc ngu can snippets", "hoc ngu coc 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: (((("hoc ngu con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc ngu con snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc ngu con snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc ngu con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.