Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"mat dan toan snippets" » "mat dan code snippets", "mat van toan snippets", "mat dan than snippets", "mat manh toan snippets", "hat dan toan snippets", "luat dan toan snippets", "mat bang toan 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: (((("mat dan toan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("mat dan toan snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( mat dan toan snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("mat dan toan snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.