Perhaps you should try some spelling variations:
"dat duc hoan snippets" » "dat duc code snippets", "dat duc hoang snippets", "dat duc hoa snippets", "dat duc toan snippets", "dat duoc hoan snippets", "dao duc hoan snippets", "dat doc hoan 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 ("dat duc hoan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("dat duc hoan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( dat duc hoan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("dat duc hoan snippets"))) or ("locating bug core snippets"))*.