Perhaps you should try some spelling variations:
cach khoan » cac khoan, cach hoan, bach khoa
thuoc dung » hoc dung, thuy dung
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
nha thuoc » nha nuoc, nhan thuc, nha hoc
phu thong » pho thong, phap thong, khau thong
thuc cach » thuoc sach, truoc cach, thuc hanh
sanh nha » sach nha, hanh nha, danh nhan
sach tai » sach bai, sach tham, sach dao
tai thuc » thai thuc, tri thuc, dai thuc
so sanh » do sanh
cho phu » cho chu, cho phan, cho thue
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: (( so sanh nha thuoc dung cho phu thong ) or ( te sach tai thuc cach khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh nha thuoc dung cho phu thong ) OR ( te sach tai thuc cach khoan phai thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh nha thuoc dung cho phu thong ) or ( te sach tai thuc cach khoan phai thong ))*.