Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nghien huu » nghien cuu, nguyen huu, nhiem huu
danh nhan » doanh nhan, thanh nhan, benh nhan
sach hoc » cach hoc, sach hoi, mach hoc
tung hoc » trung hoc, tuong hoc, dung hoc
anh khoa » doanh khoa, hang khoa
hoi danh » hop danh, hoi dan, hoc danh
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 huu tung hoc anh 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 huu tung hoc anh khoa ((hoc xa) OR (hoc ma)) hoi danh nhan tai.
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien huu tung hoc anh khoa ((hoc xa) or (hoc ma)) hoi danh nhan tai*.