Perhaps you should try some spelling variations:
thieu thuoc » hieu thuoc, hieu thuc, lieu thuoc
sach trien » sach tien, sach tren, cach thien
trien thuc » trien thuoc, tren thuc, trien thuat
thuoc bang » thuoc ban, thuoc dang, truoc bang
khoa thong » hoa thong, thoai thong, pho thong
hanh khoa » hang khoa, anh khoa, hanh hoa
phu thong » pho thong, phap thong, khau thong
bang khoa » hang khoa, dang khoa, vang khoa
khoa khoa » hoa khoa, khuan khoa, khoa hoc
khoa phu » khoa phau, khoa thu, hoa phu
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach trien thuc hanh khoa phu thong ) or ( so sach thieu thuoc bang khoa khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach trien thuc hanh khoa phu thong ) OR ( so sach thieu thuoc bang khoa khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach trien thuc hanh khoa phu thong ) or ( so sach thieu thuoc bang khoa khoa thong ))*.