Perhaps you should try some spelling variations:
sanh giao » anh giao, san giao, sach giao
giao duoc » giao duc, giac duoc, tao duoc
duoc khoa » nuoc khoa, duc khoa, huoc khoa
khoa hoc » hoa hoc
so sanh » do sanh
quan am » quan nam, quan tam, quang nam
quan ao » quan so, quang cao, quang bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh giao duoc khoa hoc - stem. stem ((quan am) OR (quan ao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh giao duoc khoa hoc - stem. stem ((quan am) OR (quan ao))".
• Adding a wildcard symbol may retrieve word variants: so sanh giao duoc khoa hoc - stem. stem ((quan am) OR (quan ao))*.