Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
khoa hoc » hoa hoc
cau nhan » chau nhan, ca nhan, cu nhan
nhan dan » phan dau, gian dan, nhan tai
sach do » sach dao, sach doi, sach lo
sach de » cach de, sach dao, sach dat
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
hoi cau » hoi chu, hoc cau, hoa cau
ma hoi » mai hoi, xa hoi, ma hoa

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