Perhaps you should try some spelling variations:
than thong » than thuong, toan thong, tran thong
tru thuoc » truc thuoc, tri thuoc, tu thuoc
thu thong » thuy thong, thu thang, thu tuong
thuoc dac » thuoc dang, thuoc sach, thuc day
khoa than » khoa luan, hoa thai, hoa tan
sanh tri » thanh tri, dinh tri, minh tri
tri thuc » tri tue
thuc dan » thuc hanh, hoc dan, thuc vat
dan khoa » dang khoa, da khoa, san khoa
khoa thu » hoai thu, ho thu
sanh tru » sach truc, anh tu, danh tu
dac khoa » da khoa, dai khoa, dau khoa
so sanh » do sanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sanh tri thuc dan khoa thu thong ) or ( so sanh tru thuoc dac khoa than thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tri thuc dan khoa thu thong ) OR ( so sanh tru thuoc dac khoa than thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tri thuc dan khoa thu thong ) or ( so sanh tru thuoc dac khoa than thong ))*.