Perhaps you should try some spelling variations:
dang thuoc » dung thuoc
thuoc sinh » hoc sinh, thu sinh
thuoc sach » hoc sach, nuoc sach, thuat sach
sach dang » sach dung, sach danh, sach nang
sinh hoat » sinh hoc, sinh vat
thu thuoc » tu thuoc, thu thuc, tru thuoc
hoat hoc » hoa hoc, hoat ho, khoa hoc
hoc cong » hoc co, cac cong, hoc dung
thuc anh » thuc hanh, thuy anh, thu anh
tu sach » thu sach, su sach, te sach
anh thu » anh thuc, anh thuy, anh tu
nha hoc » nha thuoc, khoa hoc, nha nuoc

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 dang thuoc sinh hoat hoc cong ) or ( thuc anh thu thuoc sach nha hoc cong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dang thuoc sinh hoat hoc cong ) OR ( thuc anh thu thuoc sach nha hoc cong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dang thuoc sinh hoat hoc cong ) or ( thuc anh thu thuoc sach nha hoc cong ))*.