Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tham manh do snippets" » "tham canh do snippets", "pham minh do snippets", "tham dinh do snippets", "tham manh ho snippets", "tham lanh dao snippets", "tham manh hon 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: (((("tham manh 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: (((("tham manh do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tham manh do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tham manh do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.