Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
kham thong » khap thong, khau thong, pham thuong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
thuc benh » thu benh, thuc ben, thuc hanh
sach thuc » cach thuc, sach thu, sach thue
thuc thuc » hoc thuc
khoa kham » khoa than
thu sach » tu sach, thuat sach, thuoc sach
benh kho » benh khong, benh phoi, benh hoc
kho khan » khoa than
thuc anh » thuc hanh, thuy anh, thu anh
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: (( thu sach tren thuc benh kho khan thong ) or ( te sach thuc thuc anh khoa kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach tren thuc benh kho khan thong ) OR ( te sach thuc thuc anh khoa kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach tren thuc benh kho khan thong ) or ( te sach thuc thuc anh khoa kham thong ))*.