Perhaps you should try some spelling variations:
"phap trien san kien." » "pha trien san kien." (Expand Search), "phan trien san kien." (Expand Search), "phap tien san kien." (Expand Search), "phap trien van kien." (Expand Search), "phap trien ben kien." (Expand Search), "phap trien va kien." (Expand Search), "phap trien su kien." (Expand Search)
"phap trien du kien." » "pha trien du kien." (Expand Search), "phan trien du kien." (Expand Search), "phap tien du kien." (Expand Search), "phap trien su kien." (Expand Search), "phap trien do kien." (Expand Search), "phap trien dieu kien." (Expand Search)
"phat trien san kien." » "phat trien van kien." (Expand Search), "phat trien ben kien." (Expand Search), "phat trien va kien." (Expand Search), "phat trien su kien." (Expand Search), "pham trien san kien." (Expand Search)

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: (("phat trien san kien.") OR ((("phap trien san kien.") OR ("phap trien du kien."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"phat trien san kien.\") OR (((\"phap trien san kien.\") OR (\"phap trien du kien.\"))))".
• Removing quotes may allow a broader search: (( phat trien san kien. ) OR ((( phap trien san kien. ) OR ( phap trien du kien. )))).
• Adding a wildcard symbol may retrieve word variants: (("phat trien san kien.") OR ((("phap trien san kien.") OR ("phap trien du kien."))))*.