Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hau vung doc snippets" » "hau vuong doc snippets", "thai vung doc snippets", "chau hung doc snippets", "hau vung moc snippets", "hau vung doi snippets", "hau vung hoc 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: (((("hau vung doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hau vung doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hau vung doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hau vung doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.