Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"van tao trinh snippets" » "van tao tinh snippets", "van tho trinh snippets", "van giao trinh snippets", "van thao trinh snippets", "vang tao trinh snippets", "van tai trinh snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

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: (((("using java code snippets") or ("van tao trinh snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("van tao trinh snippets"))) OR ("locating bug code slippers")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( van tao trinh snippets ))) or ( locating bug code slippers )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("van tao trinh snippets"))) or ("locating bug code slippers"))*.