Perhaps you should try some spelling variations:
khang thuoc » khong thuoc, dang thuoc, hanh thuoc
ngan khang » ngan hang, nganh khong, van khang
tong luat » tong luan, tang luat, tong quat
luat ngan » cua ngan, luat dan
cuu tong » cuu cong, cuu tinh, huu tung
thuoc la » thuoc ma, thuoc va, thuoc tai
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hoi tai » hoc tai, hoi trac
va nhan » van nhan, ca nhan, va phan
la hoi » lai hoi, xa hoi, le hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) hoi tai, nghien cuu tong luat ngan khang thuoc la hoi va nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) hoi tai, nghien cuu tong luat ngan khang thuoc la hoi va nhan tai.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) hoi tai, nghien cuu tong luat ngan khang thuoc la hoi va nhan tai*.