Perhaps you should try some spelling variations:
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
thai thuoc » thai thuc, thai hoc, nha thuoc
thuoc dang » thuoc dung, thuoc khang, thuc dan
dang khoa » dung khoa, hang khoa, dang khoi
sach dao » lanh dao
san thai » sac thai, ban thai, van thai
tu sach » thu sach, su sach, te sach
dao thu » dao thi, dao phu, dao tru
thu cac » tu cac, thu xac, thu cuc
khoa he » hoa he, khoa hoc, khong he
ke san » ke dan

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 dao thu cac khoan phai thong ) or ( ke san thai thuoc dang khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dao thu cac khoan phai thong ) OR ( ke san thai thuoc dang khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dao thu cac khoan phai thong ) or ( ke san thai thuoc dang khoa he thong ))*.