Perhaps you should try some spelling variations:
"nhat trien khai hoc" » "phat trien khai hoc", "nhat tien khai hoc", "chat thien khai hoc", "nhat trien khi hoc", "nhat trien khai thac", "nhat trien khai hoan"
"phap trien thai hoc" » "phat trien thai hoc", "phap truyen thai hoc", "phap tieng thai hoc", "phap trien thi hoc", "phap trien thanh hoc", "phap trien thuat hoc", "phap trien dai hoc", "phap trien bai hoc", "phap trien hoi hoc"
"pham trien nha hoc" » "phat trien nha hoc", "pham tien nha hoc", "pham tren nha hoc", "pham trien he hoc", "pham trien nha thuoc", "pham trien khoa hoc", "pham trien nha nuoc"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhat trien khai hoc") OR ("phap trien thai hoc"))) OR ("pham trien nha hoc"))~.
• Removing quotes may allow a broader search: (((( nhat trien khai hoc ) or ( phap trien thai hoc ))) or ( pham trien nha hoc ))~.
• Adding a wildcard symbol may retrieve word variants: (((("nhat trien khai hoc") or ("phap trien thai hoc"))) or ("pham trien nha hoc"))*.