Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu tu doi snippets" » "ngu tuc doi snippets", "ngu cu doi snippets", "ngu tu do snippets", "ngu te doi snippets", "ngu tu di 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: (((("ngu tu doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu tu doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu tu doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu tu doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.