Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
danh nhan » doanh nhan, thanh nhan, benh nhan
sach hoc » cach hoc, sach hoi, mach hoc
cuu tung » cuu tuong, huu tung, cuu tong
tung hoc » trung hoc, tuong hoc, dung hoc
hoi danh » hop danh, hoi dan, hoc danh
nhan tai » hang tai, van tai, toan tai

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 tung hoc doanh khoa ((hoc xa) or (hoc ma)) hoi danh nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoc tap, nghien cuu tung hoc doanh khoa ((hoc xa) OR (hoc ma)) hoi danh nhan tai.
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien cuu tung hoc doanh khoa ((hoc xa) or (hoc ma)) hoi danh nhan tai*.