Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
thuoc dung » hoc dung, thuy dung
phau thong » phap thong, phan thong, phan thuong
tri thuoc » tri thuc, tri hoc, tin thuoc
dung khoa » dung cho
khoa khau » khoa kham, khoa chau, khoa khac
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
khoa phau » hoa phan, khoa kham, khoa than
sach tri » sach tai, sach tren, sach truc
sach dan » sach danh, sach dao, sach dat
dan thuc » dan toc, am thuc
tu sach » thu sach, su sach, te sach

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 tri thuoc dung khoa khau thong ) or ( tu sach dan thuc cach khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tri thuoc dung khoa khau thong ) OR ( tu sach dan thuc cach khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tri thuoc dung khoa khau thong ) or ( tu sach dan thuc cach khoa phau thong ))*.