Perhaps you should try some spelling variations:
thuoc doanh » thuoc dang, thuoc dong, thuoc thanh
thuoc sinh » hoc sinh, thu sinh, thuoc sach
doanh khoa » toan khoa
sinh hoat » sinh hoc, sinh vat
thu thuoc » tu thuoc, thu thuc, tru thuoc
sach thu » sach thue, sach thieu, sach tham
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, tu cach
hoat he » hoa he, hoat ho, thuat he
te sach » toc sach

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 dung thuoc sinh hoat he thong ) or ( te sach thu thuoc doanh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dung thuoc sinh hoat he thong ) OR ( te sach thu thuoc doanh khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dung thuoc sinh hoat he thong ) or ( te sach thu thuoc doanh khoa pho thong ))*.