Perhaps you should try some spelling variations:
khoa thong » hoa thong, thoai thong, pho thong
doanh khoa » toan khoa
truoc dang » thuoc dang, truoc bang, truoc cang
thu doanh » thu oanh, tri doanh, thu hoach
khoa khoa » hoa khoa, khuan khoa, khoa hoc
dang khoi » dung khoa, hang khoa
sanh tri » thanh tri, dinh tri, minh tri
gi truoc » gian truoc, _ truoc
so sanh » do sanh
tri thu » tri thuc, thi thu, tri phu
sanh gi » sinh gi, sanh giao, sanh giua
khoi he » khoa he, khoi de, khong he

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 thu doanh khoa khoa thong ) or ( so sanh gi truoc dang khoi he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tri thu doanh khoa khoa thong ) OR ( so sanh gi truoc dang khoi he thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tri thu doanh khoa khoa thong ) or ( so sanh gi truoc dang khoi he thong ))*.