Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hau che snippets" » "van ha che snippets", "van hai che snippets", "van dau che snippets", "van han che snippets", "van phap che snippets", "van phan che 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 hau che 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 hau che snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hau che snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hau che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.