Perhaps you should try some spelling variations:
nganh dong » nganh cong, nhanh dong, nganh nong
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
thuoc xa » thuoc ma, thuoc la, thuoc tai
thuoc va » thuc va, thuoc ma, thuong va
tu sach » thu sach, su sach, te sach
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao

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