Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"toc lan dung snippets" » "toc van dung snippets", "toc dan dung snippets", "toc lan hung snippets", "toc san dung snippets", "toc la dung snippets", "ngoc lan dung 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: (((("toc lan dung snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toc lan dung snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( toc lan dung snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toc lan dung snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.