Perhaps you should try some spelling variations:
bong khoa » dong khoa, hong khoa, song khoa
danh nhan » doanh nhan, thanh nhan, benh nhan
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
cuu long » cuu cong, cuu tong, cuu nang
long hoc » dong hoc, long soc, long thuoc
hoc bong » hoc cong, hoc trong, hoc luong
khoa hoc » hoa hoc
hoi danh » hop danh, hoi dan, hoc danh
nhan tai » hang tai, van tai, toan tai
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 long hoc bong khoa hoc xa hoi danh nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (cach hoc)) tap, nghien cuu long hoc bong khoa hoc xa hoi danh nhan tai.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (cach hoc)) tap, nghien cuu long hoc bong khoa hoc xa hoi danh nhan tai*.