Perhaps you should try some spelling variations:
nganh khong » nganh cong, nganh nong, nganh khoa
nhanh chong » thanh cong, khanh phong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
sach hoi » sach doi, sach moi, cach thoi
cong hoc » dong hoc, cong hoa, cong coc
phat van » pham van, phan van, phap van
su sach » so sach, vu sach
hoi tap » hoi dap, hoc tap, hoi tai
hoc bai » hoc dai, hoc giai
bai hoi » bai choi, bai hoc, dai hoi

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 hoi tap, nghien thu cong hoc ((nganh khong) OR (nhanh chong)) hoc bai hoi va phat van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoi tap, nghien thu cong hoc ((nganh khong) OR (nhanh chong)) hoc bai hoi va phat van".
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien thu cong hoc ((nganh khong) OR (nhanh chong)) hoc bai hoi va phat van*.