Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
khoa hoc » hoa hoc
phan dau » phan tu, hang dau
te sach » toc sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
ca phan » cac phan, cao phan, cap phan
do dap » doi dap, do dai, do dan
do dac » do duc, do dai, so dac
ma hoi » mai hoi, xa hoi, ma hoa
hoi ca » hoi cua, hoi cac, hoi cau

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((do dap) OR (do dac)), nghien cuu mon hoc nganh khoa hoc ma hoi ca phan dau~".
• Adding a wildcard symbol may retrieve word variants: te sach ((do dap) OR (do dac)), nghien cuu mon hoc nganh khoa hoc ma hoi ca phan dau*.