Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hoi doanh » hoa doanh, voi doanh, doi doanh
sach hoc » cach hoc, sach hoi, mach hoc
cuu tung » cuu tuong, huu tung, cuu tong
tung hoc » trung hoc, tuong hoc, dung hoc
anh khoa » doanh khoa, hang khoa
nhan tai » hang tai, van tai, toan tai
hoc anh » hoc nganh, hoc nhanh, ngoc anh

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