Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
thuoc la » thuoc ma, thuoc va, thuoc tai
van nhan » van phan, van thanh, danh nhan
so sach » so sanh, bo sach, co sach
va nhan » ca nhan, va phan, va nha
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: so sach hoc tap, nghien cuu dong hoc nganh khong thuoc la hoi ((va nhan) OR (van nhan)) van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoc tap, nghien cuu dong hoc nganh khong thuoc la hoi ((va nhan) OR (van nhan)) van".
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cuu dong hoc nganh khong thuoc la hoi ((va nhan) OR (van nhan)) van*.