Perhaps you should try some spelling variations:
khang khoan » khang khuan, hang khoa, chung khoan
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
khau thong » khau thuong, khap thong, khau tong
thu thuoc » tu thuoc, thu thuc, tru thuoc
cua thuoc » nha thuoc, cay thuoc, cua nuoc
thuoc ban » thuoc tan, thuoc dang, thu ban
khoa khau » khoa kham, khoa phau, khoa chau
thu sach » thuat sach, thuoc sach, thu hoach
sach thu » sach thue, sach thieu, sach tham
sach cua » mach cua, cach cua, sac cua
ban khoa » san khoa, van khoa, ba khoa
tu sach » su sach, te sach, tu cach

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 phai thong ) or ( tu sach cua thuoc ban khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach thu thuoc khang khoan phai thong ) OR ( tu sach cua thuoc ban khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach thu thuoc khang khoan phai thong ) or ( tu sach cua thuoc ban khoa khau thong ))*.