Perhaps you should try some spelling variations:
hang khoa » dung khoa
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
hoc hang » hoc hanh, hoc bang, hoc tang
khoa hoc » hoa hoc
hoi benh » hoc benh, hoa benh, hoi binh
nhan tao » nhan tai, nhan dan
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: tu ((sach hoc) or (cach hoc)) tap, nghien cuu dong hoc hang khoa hoc xa hoi benh nhan tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (cach hoc)) tap, nghien cuu dong hoc hang khoa hoc xa hoi benh nhan tao.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (cach hoc)) tap, nghien cuu dong hoc hang khoa hoc xa hoi benh nhan tao*.