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