Perhaps you should try some spelling variations:
"hang ca nghe snippets" » "hang ca code snippets", "hang va nghe snippets", "nang cao nghe snippets", "hang tai nghe snippets", "hang cap nghe snippets", "hang cua nghe snippets", "hang cac nghe snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data 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: (((("python using java snippets") or ("hang ca nghe snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("hang ca nghe snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( hang ca nghe snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("hang ca nghe snippets"))) or ("locating bug core snippets"))*.