Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"van trinh cua snippets" » "van thinh cua snippets", "van tinh cua snippets", "dan trinh cua snippets", "van trinh luat snippets", "van trinh quan snippets"
"locating bug core snippets" » "locating bug code snippets"

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 trinh cua snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using java code snippets\") OR (\"van trinh cua snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( using java code snippets ) OR ( van trinh cua snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") OR ("van trinh cua snippets"))) OR ("locating bug core snippets"))*.