Perhaps you should try some spelling variations:
thuoc hoach » thu hoach, thuoc sach
hoach dinh » hoang dinh
ton giao » toan giao, so giao, don gian
dinh suu » dinh cuu, dinh huu, dinh su
hoc giao » hoc cao
su sach » so sach, vu sach
kinh su » kinh suu, hinh su, dinh su

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach kinh su - ton giao ) or ( thuoc hoach dinh suu - hoc giao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach kinh su - ton giao ) OR ( thuoc hoach dinh suu - hoc giao )).
• Adding a wildcard symbol may retrieve word variants: (( su sach kinh su - ton giao ) or ( thuoc hoach dinh suu - hoc giao ))*.