Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
anh khoa » doanh khoa, hang khoa
danh hoa » thanh hoa, khanh hoa, nganh hoa
te sach » toc sach
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma

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 hoc tap, nghien cuu dong co ((anh khoa) or (danh hoa)) hoc xa hoi va nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoc tap, nghien cuu dong co ((anh khoa) OR (danh hoa)) hoc xa hoi va nhan va.
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu dong co ((anh khoa) or (danh hoa)) hoc xa hoi va nhan va*.