Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khi toc hoc snippets" » "khi hoc hoc snippets", "khi toi hoc snippets", "khi tot hoc snippets", "khi toan hoc snippets", "khi duoc 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: (((("khi toc 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: (((("khi toc hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khi toc hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khi toc hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.