Perhaps you should try some spelling variations:
"ngu dan cach snippets" » "ngu dan code snippets", "ngu dan cac snippets", "ngu dan canh snippets", "ngu nhan cach snippets", "ngu danh cach snippets", "ngu van cach snippets", "nguoi dan cach 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 ("ngu dan cach snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("ngu dan cach snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( ngu dan cach snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("ngu dan cach snippets"))) or ("locating bug core snippets"))*.