Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van luan ho snippets" » "van quan ho snippets", "van tuan ho snippets", "von luan ho snippets", "van luan hoc snippets", "van luan pho snippets", "van xuan ho 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 luan ho 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 luan ho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van luan ho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van luan ho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.