Perhaps you should try some spelling variations:
khac thuong » hoc thuong, phan thuong, pham thuong
phau thong » phap thong, khau thong, phan thong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa khac » khoa kham, khoanh khac, khoa hoc
cach thuc » anh thuc, cac thu
thuc thuy » thuc thuc, thu thuy, thac thuy
khoa phau » hoa phan, khoa kham, khoa than
thuy dac » thu dac, thuy dao, thuoc dac
dac khoa » da khoa, dai khoa, dau khoa
te sach » toc sach
su cach » su sach, tu cach, su cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tren thuc hanh khoa khac thuong ) or ( su cach thuc thuy dac khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tren thuc hanh khoa khac thuong ) OR ( su cach thuc thuy dac khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tren thuc hanh khoa khac thuong ) or ( su cach thuc thuy dac khoa phau thong ))*.