Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
te sach » toc sach
sach do » sach dao, sach doi, sach de
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi cau » hoi chu, hoc cau, hoa cau
do dac » do duc, do dai, so dac
hoi ca » hoi cua, hoi cac, hoi va

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 dac, nghien cuu mon hoc nganh khoa hoc ma ((hoi ca) OR (hoi cau)) nhan dan~".
• Adding a wildcard symbol may retrieve word variants: te sach do dac, nghien cuu mon hoc nganh khoa hoc ma ((hoi ca) OR (hoi cau)) nhan dan*.