Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"manh hoc do snippets" » "anh hoc do snippets", "manh ho do snippets", "manh hon do snippets", "manh hoc doi snippets", "manh hoc co snippets", "manh hoc bo 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: (((("manh hoc do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("manh hoc do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( manh hoc do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("manh hoc do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.