Perhaps you should try some spelling variations:
khang khoan » khang khuan, hang khoa, chung khoan
thu thuoc » thu thuc, tru thuoc, truc thuoc
khoan hoi » khoan nhoi, khoa hoi, khoa hoc
hoi thong » hoi thuong, hoi trong, hoa thong
thuoc ban » thuoc tan, thuoc dang, thu ban
khoa khau » khoa kham, khoa phau, khoa chau
khau tong » khau thong, khau cong, khau thuong
thu sach » thuat sach, thuoc sach, thu hoach
sach thu » sach thue, sach thieu, sach tham
tu thuoc » truc thuoc, tu thuong, cua thuoc
ban khoa » san khoa, van khoa, ba khoa
tu sach » su sach, te sach, tu cach
sach tu » cach tu, sach ty, sach uu

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

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