Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"trac hoc chi snippets" » "toan hoc chi snippets", "thai hoc chi snippets", "toc hoc chi snippets", "trac hoc chia snippets", "trac hoc cho snippets", "trac hoc chu 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: (((("trac hoc chi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trac hoc chi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trac hoc chi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trac hoc chi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.