Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi van code snippets" » "thi van de snippets", "thi van hoe snippets", "thi van cong snippets", "thi lan code snippets", "thi hanh code snippets", "thi nang code snippets"
"locating bug core snippets" » "locating bug code 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: (((("thi van code snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi van code snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( thi van code snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi van code snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.