Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nhanh khoa » nhan khoa, nganh khoa, hang khoa
hoc nhanh » hoc nganh, hoc phan
khoa hoc » hoa hoc
gian dan » gian lang
doi tap » doi tac, doi tai, doi tan
doi dap » hoi dap, doi dau, do dap
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va gian » va gianh, van gian, va giai
mo hoc » mon hoc, co hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((doi tap) or (doi dap)), nghien cuu mo hoc nhanh khoa hoc mai hoi va gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((doi tap) OR (doi dap)), nghien cuu mo hoc nhanh khoa hoc mai hoi va gian dan.
• Adding a wildcard symbol may retrieve word variants: thuat sach ((doi tap) or (doi dap)), nghien cuu mo hoc nhanh khoa hoc mai hoi va gian dan*.