Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nhe hoc cong snippets" » "nhe hoc co snippets", "nhe cac cong snippets", "nhe hoc dung snippets", "nghe hoc cong snippets", "nha hoc cong snippets", "nhiet 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: (((("nhe 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: (((("nhe hoc cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhe hoc cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhe hoc cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.