Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
phan thong » phan thuong, phan hong, phan tong
khoa kham » kho khan, khoa than
sach bien » cach bien, sach tien, mach dien
bien thuc » kien thuc, bien phuc, bien phu
thuc cach » thuoc sach, truoc cach, thuc hanh
sanh tri » thanh tri, dinh tri, minh tri
tri hanh » troi hanh, thi hanh, tri hang
hanh cac » hang cac, hanh cat, nhanh cay
cac khoa » cac khoan, cac khoi, dac khoa
thu sach » tu sach, thuat sach, thuoc sach
cach hoa » cach hoan, cach hoc, bach hoa
hoa phan » hoa dan, co phan
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 hanh cac khoa kham thong ) or ( thu sach bien thuc cach hoa phan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tri hanh cac khoa kham thong ) OR ( thu sach bien thuc cach hoa phan thong ))*.