Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu van doi snippets" » "hieu va doi snippets", "thien van doi snippets", "lieu va doi snippets", "hieu van loi snippets", "hieu van noi snippets", "hieu van do 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: (((("hieu van 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: (((("hieu van doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu van doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu van doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.