Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
sach hoi » sach doi, sach moi, cach thoi
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
hai van » thai van, ha van, hai tan
nhan va » nhan tai, nhan tao, phan van
mo hoc » mon hoc, co hoc
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 tap, nghien cuu mo hoc nganh khoa hoc xa hai van ((nhan va) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien cuu mo hoc nganh khoa hoc xa hai van ((nhan va) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien cuu mo hoc nganh khoa hoc xa hai van ((nhan va) or (nhan dan))*.