Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nghien huu » nghien cuu, nguyen huu, nhiem huu
thanh nhan » thanh phan, thanh san, thanh toan
danh nhan » doanh nhan, benh nhan, dung nhan
sach hoc » cach hoc, sach hoi, mach hoc
tung hoc » trung hoc, tuong hoc, dung hoc
hoc anh » hoc nganh, hoc nhanh, ngoc anh
anh hoa » anh khoa, danh hoa, hanh hoa
hoc xa » hoc ma
xa hoc » xa hoi, va hoc, xa hoa

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 hoa hoc xa hoc ((danh nhan) OR (thanh nhan)) tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach hoc tap, nghien huu tung hoc anh hoa hoc xa hoc ((danh nhan) OR (thanh nhan)) tai".
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien huu tung hoc anh hoa hoc xa hoc ((danh nhan) OR (thanh nhan)) tai*.