Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet ta du snippets" » "viet tay du snippets", "viet ha du snippets", "viet tu du snippets", "viet ta duy snippets", "viet tai du snippets", "viet ta deu snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("viet ta du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet ta du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet ta du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet ta du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.