Perhaps you should try some spelling variations:
nganh hoa » thanh hoa, khanh hoa, danh hoa
sach hoi » sach doi, sach moi, cach thoi
cuu dong » cuu cong, cuu tong, cuu long
co nganh » hoc nganh, cac nganh, moi nganh
nhan dan » phan dau, nhan tai
gian dan » gian lang
tu sach » thu sach, su sach, te sach
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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