Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luc lap toan snippets" » "luc tap toan snippets", "luc lap doanh snippets", "luc phap toan snippets", "luc lam toan snippets", "tuc lap toan snippets", "luc luan toan 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: (((("luc lap toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luc lap toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luc lap toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luc lap toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.