Perhaps you should try some spelling variations:
sach doi » sach hoi, sach moi, sach dao
hoc danh » hoc anh, hoc hanh, hoc nganh
khoa hoc » hoa hoc
cau nhan » chau nhan, ca nhan, cu nhan
te sach » toc sach
doi dap » hoi dap, doi dau, do dap
cuu mon » cuu mo, cuu mot, cuu cong
hoi cau » hoi chu, hoc cau, hoa cau
nhan va » nhan tai, nhan dan, nhan tao
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: te sach doi dap, nghien cuu mon ((hoc danh) or (hoc dan)) khoa hoc ma hoi cau nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach doi dap, nghien cuu mon ((hoc danh) OR (hoc dan)) khoa hoc ma hoi cau nhan va.
• Adding a wildcard symbol may retrieve word variants: te sach doi dap, nghien cuu mon ((hoc danh) or (hoc dan)) khoa hoc ma hoi cau nhan va*.