Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"duc danh du snippets" » "duc danh code snippets", "duc anh du snippets", "duc manh du snippets", "duc hanh du snippets", "duc danh dau snippets", "duc danh tu snippets", "duc dinh du 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: (((("duc danh du snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc danh du snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( duc danh du snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc danh du snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.