Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet doi hoc snippets" » "viet duoi hoc snippets", "viet voi hoc snippets", "nhiet doi hoc snippets", "viet doi hoac snippets", "viet dai hoc snippets", "viet hoi 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: (((("viet doi 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: (((("viet doi hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet doi hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet doi hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.