Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
khong thuc » khong thuoc, phong thuc, thuong thuc
khong chuc » khong thuoc, cong chuc, hong phuc
hoc nhanh » hoc nganh, hoc phan
sach hoi » sach doi, sach moi, cach thoi
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
dan nhan » danh nhan, dan chan, van nhan
nhan tai » hang tai, van tai, toan tai
hoi tap » hoi dap, hoc tap, hoi tai
hoa » khoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: nguoi sach hoi tap, nghien cuu cong hoc nhanh ((khong thuc) or (khong chuc)) van hoa dan nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nguoi sach hoi tap, nghien cuu cong hoc nhanh ((khong thuc) OR (khong chuc)) van hoa dan nhan tai.
• Adding a wildcard symbol may retrieve word variants: nguoi sach hoi tap, nghien cuu cong hoc nhanh ((khong thuc) or (khong chuc)) van hoa dan nhan tai*.