Perhaps you should try some spelling variations:
thuyet trinh » thuyet kinh
thac thuyet » thay thuyet, hoc thuyet, tac huyet
thoai trong » thoai thong, ngoai trong, tai trong
khoa thoai » hoa thai, hoi thoai, khoa than
trinh khoa » trinh hoa, sinh khoa, trinh hoi
chau thong » chau phong, khau thong, chan thuong
sach tham » sach nha
tham thuy » thai thuy, pham thuy, thac thuy
sach thac » sach nha, cach thuc, sach han
khoa chau » khoai chau, khoa phau, khoa cham
thuy anh » thuy linh
anh khoa » doanh khoa, hang khoa
te sach » toc sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tham thuy anh khoa thoai trong ) or ( te sach thac thuyet trinh khoa chau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tham thuy anh khoa thoai trong ) OR ( te sach thac thuyet trinh khoa chau thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tham thuy anh khoa thoai trong ) or ( te sach thac thuyet trinh khoa chau thong ))*.