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, nhan tai
gian dan » gian lang
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
ma hoi » mai hoi, xa hoi, ma hoa

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