Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"den hieu do snippets" » "den hieu code snippets", "de hieu do snippets", "den hien do snippets", "ten hieu do snippets", "den hieu so snippets", "den hieu bo snippets", "den bieu do snippets"
"python using java snippets" » "python using data 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 hieu do snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den hieu do snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( den hieu do snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den hieu do snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.