Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi khong do snippets" » "thi hong do snippets", "thi phuong do snippets", "khoi khong do snippets", "thi khong co snippets", "thi khong lo snippets", "thi khong de 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 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: (((("thi khong do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi khong do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi khong do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.