Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
thuc khanh » thuc hanh, phuc khanh, thuc thanh
khanh khoa » khanh hoa, hang khoa, doanh khoa
tron thuc » trong thuc, toan thuc, trong thu
thuc dang » thuoc dang, thuc dan, thuc dung
dang khoi » dung khoa, hang khoa
khoi kham » kho khan, hoi cham, hoc kham
sach tren » sach tien, sach tranh
tren thuc » trien thuc, trinh thuc, trong thuc
khoa kham » kho khan, khoa than
cac tron » cac tro, cac truong, tac trong
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: (( tu cac tron thuc dang khoi kham thong ) or ( te sach tren thuc khanh khoa kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cac tron thuc dang khoi kham thong ) OR ( te sach tren thuc khanh khoa kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cac tron thuc dang khoi kham thong ) or ( te sach tren thuc khanh khoa kham thong ))*.