Perhaps you should try some spelling variations:
dohang khoa » hang khoa, doanh khoa, dong khoa
khan thong » khap thong, nhan thong, phan thong
khau thong » khau thuong, khap thong, khau tong
tham thuc » nham thuc, pham thuc, tam thuc
sach thai » sach tham, sac thai, sach tai
khoa khau » khoa kham, khoa phau, khoa chau
sac tham » sach tham, sac thai, hoac tham
thuc anh » thuc hanh, thuy anh, thu anh
kho khan » khoa kham, khoa than
thai tuc » thai thuc, thai thuy, thai hoc
anh kho » anh khoa, anh tho, anh cho
tu sach » thu sach, su sach, te sach
tu sac » tu cac, tu san, tu bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sac tham thuc anh kho khan thong ) or ( tu sach thai tuc dohang khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sac tham thuc anh kho khan thong ) OR ( tu sach thai tuc dohang khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sac tham thuc anh kho khan thong ) or ( tu sach thai tuc dohang khoa khau thong ))*.