Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
hoc nganh » hoc nhanh
sach hoi » sach doi, sach moi, cach thoi
khoa hoc » hoa hoc
cong hoa » dong hoa, dong hoc, hang hoa
dap nhan » dap nha, dac nhan, danh nhan
dam nhan » dam phan, cam nhan, dac nhan
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai

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 hoi tap, nghien cuu khoa hoc nganh cong hoa xa hoi ((dap nhan) or (dam nhan)) dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien cuu khoa hoc nganh cong hoa xa hoi ((dap nhan) OR (dam nhan)) dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien cuu khoa hoc nganh cong hoa xa hoi ((dap nhan) or (dam nhan)) dan*.