Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
cac choi » cac thoi, cac khoi, cach thoi
hoc cac » hoc cao
va gian » va gianh, van gian, va gia
cuu co » huu co, cua co, cuu mo

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 hoc tap, nghien cuu co hoc nganh khoa hoc cac choi ((va gian) or (va giai)) lang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoc tap, nghien cuu co hoc nganh khoa hoc cac choi ((va gian) OR (va giai)) lang.
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien cuu co hoc nganh khoa hoc cac choi ((va gian) or (va giai)) lang*.