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