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