Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"hieu dan cac snippets" » "hieu dan code snippets", "hieu van cac snippets", "sieu dan cac snippets", "hieu dac cac snippets", "hieu dan cach snippets", "hieu dang cac snippets", "hieu dan ca 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: (((("hieu dan cac snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hieu dan cac snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hieu dan cac snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu dan cac snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.