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