Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"de tang toan snippets" » "de dang toan snippets", "de tang tan snippets", "de thanh toan snippets", "le tang toan snippets", "do tang 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: (((("de tang 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: (((("de tang toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( de tang toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("de tang toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.