Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
doi tap » doi tac, doi dap, doi tan
doi tai » hoi tai, dai tai, doi tac
va nhan » van nhan, ca nhan, va phan
mo hoc » mon hoc, co hoc
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: thuoc sach ((doi tap) OR (doi tai)), nghien cuu mo hoc nganh khoa hoc ma hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((doi tap) OR (doi tai)), nghien cuu mo hoc nganh khoa hoc ma hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((doi tap) OR (doi tai)), nghien cuu mo hoc nganh khoa hoc ma hoi va nhan dan*.