Perhaps you should try some spelling variations:
khong thuoc » hong phuoc, dong thuoc, khoa thuoc
khang thuoc » dang thuoc, hanh thuoc, khau thuoc
sach hoi » sach doi, sach moi, cach thoi
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
hoc phan » hoc dan, hoc pho
phap vat » phap luat, phap phat, phap viet
su sach » so sach, vu sach
hoi tai » hoc tai, hoi trac
van hoc » van hoa
hoc ban » hoc bang, hoc dan, hoc bai

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoi tai, nghien cuu tong hoc phan ((khong thuoc) OR (khang thuoc)) van hoc ban phap vat~".
• Adding a wildcard symbol may retrieve word variants: su sach hoi tai, nghien cuu tong hoc phan ((khong thuoc) OR (khang thuoc)) van hoc ban phap vat*.