Perhaps you should try some spelling variations:
"pha du hoan snippets" » "pha du code snippets", "pha duc hoan snippets", "pha du doan snippets", "pha su hoan snippets", "pham duc hoan snippets", "pham duy hoan snippets", "phan duc 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 ("pha du 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 ("pha du hoan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( pha du hoan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("pha du hoan snippets"))) or ("locating bug core snippets"))*.