Perhaps you should try some spelling variations:
tren thuoc » trien thuoc, tren thuc, trung thuoc
thuoc bach » thuoc sach, thuoc ban, truc bach
kham thong » khap thong, khau thong, pham thuong
khan thong » khap thong, khau thong, nhan thong
sach tren » sach tien, sach tranh
bach khoa » anh khoa
khoa kham » khoa than
cach thuc » anh thuc, cac thu
thuc tiep » thuc tien, truc tiep, thuc hien
tiep benh » trieu benh, vien benh, tren benh
thu cach » thuc cach, thu canh, tu cach
benh kho » benh khong, benh phoi, benh hoc
kho khan » khoa than
tu sach » thu sach, su sach, te 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 sach tren thuoc bach khoa kham thong ) or ( thu cach thuc tiep benh kho khan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren thuoc bach khoa kham thong ) OR ( thu cach thuc tiep benh kho khan thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren thuoc bach khoa kham thong ) or ( thu cach thuc tiep benh kho khan thong ))*.