Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
nganh khong » nganh cong, nhanh chong, nganh nong
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu long, luu dong
cuu tong » cuu cong, cuu tinh, huu tung
thuoc xa » thuoc ma, thuoc va, thuoc la
van nhan » van phan, van thanh, danh nhan
nhan van » nhan dan, nhan va, phan van
so sach » so sanh, bo sach, co sach
hoi van » hoi va, hoi dan, hai van

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoc tap, nghien ((cuu dong) OR (cuu tong)) hoc nganh khong thuoc xa hoi van nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoc tap, nghien ((cuu dong) OR (cuu tong)) hoc nganh khong thuoc xa hoi van nhan van".
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien ((cuu dong) OR (cuu tong)) hoc nganh khong thuoc xa hoi van nhan van*.