Perhaps you should try some spelling variations:
"khien ban nam trinh doc." » "khien bang nam trinh doc.", "kien ban nam trinh doc.", "khien canh nam trinh doc.", "khien ban lap trinh doc.", "khien ban nam dinh doc.", "khien ban nam trong doc.", "khien ban nam trinh do.", "khien ban nam trinh hoa.", "khien ban nam trinh co.", "khien van nam trinh doc.", "khien dan nam trinh doc.", "khien bac nam trinh doc."
"thien ban ham trinh doc." » "thien ban ham trinh do.", "thien ban ham trinh hoa.", "thien ban ham trinh co.", "thien bang ham trinh doc.", "thien van ham trinh doc.", "thien bao ham trinh doc.", "thien ban hanh trinh doc.", "thien ban lap trinh doc.", "thien ban lam tinh doc.", "thien ba ham trinh doc.", "thien ban phap trinh doc."
"phien ban hang dinh ngoc." » "phien ban hoang dinh ngoc.", "phien ban dang dinh ngoc.", "phien ban hang dich ngoc.", "phien ngan hang dinh ngoc."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("khien ban nam trinh doc.") or ("thien ban ham trinh doc."))) or ("phien ban hang dinh ngoc."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khien ban nam trinh doc.") OR ("thien ban ham trinh doc."))) OR ("phien ban hang dinh ngoc.")).
• Removing quotes may allow a broader search: (((( khien ban nam trinh doc. ) or ( thien ban ham trinh doc. ))) or ( phien ban hang dinh ngoc. )).
• Adding a wildcard symbol may retrieve word variants: (((("khien ban nam trinh doc.") or ("thien ban ham trinh doc."))) or ("phien ban hang dinh ngoc."))*.