Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ket lap toan snippets" » "ket tap toan snippets", "ket lap doanh snippets", "ket phap toan snippets", "ke lap toan snippets", "ket nap toan snippets", "kien lap 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: (((("ket 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: (((("ket lap toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ket lap toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ket lap toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.