Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van duc ro snippets" » "van duy ro snippets", "van du ro snippets", "tran duc ro snippets", "van ruc ro snippets", "van duc mo snippets", "van duc so 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: (((("van duc ro snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van duc ro snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van duc ro snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duc ro snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.