Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nganh khoa » nganh khong, doanh khoa, anh khoa
nganh hoa » thanh hoa, khanh hoa, danh hoa
sach toi » sach doi, sach hoi, sach moi
nhan tai » hang tai, van tai, toan tai
toi tap » toi gap, toan tap, tong tap
hoc lai » hoc dai, hoc bai, hoc lam
lai roi » lai hoi, loi roi
va nhan » van nhan, ca nhan, va phan
cuu co » huu co, cua co, cuu mo
roi va » hoi va, noi va, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach toi tap, nghien cuu co hoc ((nganh khoa) or (nganh hoa)) hoc lai roi va nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach toi tap, nghien cuu co hoc ((nganh khoa) OR (nganh hoa)) hoc lai roi va nhan tai.
• Adding a wildcard symbol may retrieve word variants: thuoc sach toi tap, nghien cuu co hoc ((nganh khoa) or (nganh hoa)) hoc lai roi va nhan tai*.