Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, 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
van phan » van phong, van thanh, luan phan
phan van » pham van, thanh van, luan van
su sach » so sach, vu 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: su sach hoc tap, nghien cuu cong hoc nganh khong ((thuoc xa) OR (thuoc va)) hoi van phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoc tap, nghien cuu cong hoc nganh khong ((thuoc xa) OR (thuoc va)) hoi van phan van".
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu cong hoc nganh khong ((thuoc xa) OR (thuoc va)) hoi van phan van*.