Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi khong co snippets" » "thi hong co snippets", "thi phuong co snippets", "khoi khong co snippets", "thi thong co snippets", "thi khong lo snippets", "thi khong bao 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: (((("thi khong co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi khong co snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi khong co snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi khong co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.