Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lan moi cho snippets" » "ban moi cho snippets", "can moi cho snippets", "luat moi cho snippets", "lan moi co snippets", "lan hoi cho snippets", "lan mo cho 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: (((("lan moi cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lan moi cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan moi cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan moi cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.