Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hap dan toi snippets" » "hat dan toi snippets", "hai dan toi snippets", "ham dan toi snippets", "hap dan toc snippets", "hap dan thi snippets", "hap van toi 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: (((("hap dan toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hap dan toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hap dan toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hap dan toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.