Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vao cong doi snippets" » "va cong doi snippets", "cao cong doi snippets", "van cong doi snippets", "vao vong doi snippets", "vao cong dot snippets", "vao cong goi 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: (((("vao cong doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vao cong doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vao cong doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vao cong doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.