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