Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den va hoi snippets" » "dien va hoi snippets", "den vai hoi snippets", "den vay hoi snippets", "den xa hoi snippets", "den va hoc snippets", "den va hoa 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: (((("den va hoi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den va hoi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den va hoi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den va hoi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.