Perhaps you should try some spelling variations:
than thong » than thuong, toan thong, tran thong
thuoc bach » thuoc sach, thuoc ban, truc bach
canh khoa » anh khoa, xanh khoa, doanh khoa
khoa than » khoa luan, hoa thai, hoa tan
nha thuoc » nha nuoc, nhan thuc, nha hoc
bach khoa » anh khoa
pho thong » he thong
thu canh » thuc hanh, thu cong, thu ban
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, te sach
sach ba » sach bai, sach bac, sach bao
vu sach » vu bach, su sach, vu khach
ba thu » va thu, ma thu, ca thu

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 ba thu canh khoa than thong ) or ( vu sach nha thuoc bach khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ba thu canh khoa than thong ) OR ( vu sach nha thuoc bach khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach ba thu canh khoa than thong ) or ( vu sach nha thuoc bach khoa pho thong ))*.