Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngan danh he snippets" » "ngan hang he snippets", "ngan sach he snippets", "nhan dan he snippets", "ngan danh het snippets", "ngan dan he snippets", "ngan hanh he 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: (((("ngan danh he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngan danh he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngan danh he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngan danh he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.