Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tra thi doan snippets" » "tra thai doan snippets", "tra thi hoan snippets", "tra thi loan snippets", "tran thi doan snippets", "ta thi doan snippets", "tra ghi doan 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: (((("tra thi doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tra thi doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tra thi doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tra thi doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.