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