Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
va nhan » van nhan, va phan, va nha
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: thuat sach hoc tap, nghien cuu dong hoc dan khoa hoc xa hoi ((va nhan) or (ca nhan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoc tap, nghien cuu dong hoc dan khoa hoc xa hoi ((va nhan) OR (ca nhan)) van.
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien cuu dong hoc dan khoa hoc xa hoi ((va nhan) or (ca nhan)) van*.