Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hen hoc cong snippets" » "hen hoc co snippets", "hen cac cong snippets", "hen hoc dung snippets", "hen ho cong snippets", "den hoc cong snippets", "khien hoc cong 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: (((("hen hoc cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hen hoc cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hen hoc cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hen hoc cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.