Perhaps you should try some spelling variations:
phau thong » phap thong, phan thong, phan thuong
thuoc sach » hoc sach, nuoc sach, thuat sach
khau thong » khau thuong, khap thong, khau tong
dao thuoc » cao thuoc, tao thuoc, dang thuoc
sach khoa » bach khoa, sach nha, anh khoa
khoa phau » hoa phan, khoa kham, khoa than
sach dao » lanh dao
sach dai » sach bai, sach dat, sach dau
che khau » che pham, cau khau, che khoa
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
dai thu » dai thua, dai thuc, doi thu
thu cac » tu cac, thu xac, thu cuc
cac che » cac he, cac chien, cac chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach dao thuoc sach khoa phau thong ) or ( su sach dai thu cac che khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dao thuoc sach khoa phau thong ) OR ( su sach dai thu cac che khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dao thuoc sach khoa phau thong ) or ( su sach dai thu cac che khau thong ))*.