Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using sat snippets" » "python using data snippets", "python using a snippets", "python using raw snippets"
"van duong thu snippets" » "van dong thu snippets", "van dung thu snippets", "van phong thu snippets", "van duong thuy snippets", "van duong thi snippets", "van luong thuc 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: (((("python using sat snippets") or ("van duong thu snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using sat snippets") OR ("van duong thu snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using sat snippets ) or ( van duong thu snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using sat snippets") or ("van duong thu snippets"))) or ("locating bug core snippets"))*.