Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"tu lieu cao snippets" » "tu lieu code snippets", "tu lieu dao snippets", "tu lieu co snippets", "tu lieu bao snippets", "du lieu cao snippets", "tu liem cao snippets", "tai lieu cao 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: (((("tu lieu cao snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tu lieu cao snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( tu lieu cao snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tu lieu cao snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.