Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nganh khoa » nganh hoa, nganh khong, doanh khoa
sach thoi » cach thoi, sach hoi, sach tham
thoi tap » toi tap, hoc tap, thoi dai
cuu dong » cuu cong, cuu tong, cuu long
co nganh » hoc nganh, cac nganh, moi nganh
khoa hoc » hoa hoc
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va nhan » van nhan, va phan, va nha

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 thoi tap, nghien cuu dong co nganh khoa hoc mai hoi ((va nhan) OR (ca nhan)) va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach thoi tap, nghien cuu dong co nganh khoa hoc mai hoi ((va nhan) OR (ca nhan)) va".
• Adding a wildcard symbol may retrieve word variants: thuoc sach thoi tap, nghien cuu dong co nganh khoa hoc mai hoi ((va nhan) OR (ca nhan)) va*.