Perhaps you should try some spelling variations:
dong thuoc » dung thuoc, dang thuoc, don thuoc
nganh dong » nganh cong, nhanh dong, nganh nong
hoc nganh » hoc nhanh
phap phat » phap luat
dong hoc » dong co, dong luc
cuu dong » cuu cong, cuu tong, cuu long
sach hoi » sach doi, sach moi, cach thoi
thuoc va » thuc va, thuoc ma, thuong va
phap vat » phap luat, phap viet, phap day
hoi tai » hoc tai, hoi trac
hoi dan » hoa dan, hoc dan, hoi dap
so sach » so sanh, bo sach, co sach
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoi tai, nghien cuu dong hoc nganh dong thuoc va hoi dan ((phap vat) or (phap phat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoi tai, nghien cuu dong hoc nganh dong thuoc va hoi dan ((phap vat) OR (phap phat)).
• Adding a wildcard symbol may retrieve word variants: so sach hoi tai, nghien cuu dong hoc nganh dong thuoc va hoi dan ((phap vat) or (phap phat))*.