Perhaps you should try some spelling variations:
"nganh nghe c snippets" » "nang nghe c snippets", "anh nghe c snippets", "hanh nghe c snippets", "nganh nghe co snippets", "nganh nghe ca snippets", "nganh nghe _ snippets"
"python using java snippets" » "python using data 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: (((("nganh nghe c snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nganh nghe c snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nganh nghe c snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nganh nghe c snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.