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