Perhaps you should try some spelling variations:
sach giao » cach giao, sach dao, anh giao
giao duoc » giao duc, giac duoc, tao duoc
duoc khoa » nuoc khoa, duc khoa, huoc khoa
xuan nang » luan nang, xuan hoang, van nang
khoa hoc » hoa hoc
xuan nam » xuan nhan, van nam, xuan mai
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach giao duoc khoa hoc - stem. sam ((((xuan nam) OR (quang nam))) or (xuan nang))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach giao duoc khoa hoc - stem. sam ((((xuan nam) OR (quang nam))) OR (xuan nang)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach giao duoc khoa hoc - stem. sam ((((xuan nam) OR (quang nam))) or (xuan nang))".
• Adding a wildcard symbol may retrieve word variants: te sach giao duoc khoa hoc - stem. sam ((((xuan nam) OR (quang nam))) or (xuan nang))*.