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