Perhaps you should try some spelling variations:
duong thuoc » dung thuoc, dong thuoc, duong phuoc
nhung thoi » nhung thi, phung thi, nhung tri
boi duong » hai duong, doi tuong, con duong
nhung loi » nhung bai, nhung bi, nhung gi
noi trung » doi trung, nhi trung, hoi trung
trung hoc » trung quoc
thoi quy » thi quy, thoi quen, thoi ky
thuoc ma » hoc ma, duoc ma
quy van » duy van, qua van, quyet van
loi quy » loi que, doi quy, noi quy
hoc mon » hoc moi, hoc mot, hoc cong

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( nhung thoi quy van. boi duong thuoc ma ) OR ( nhung loi quy van. noi trung hoc mon ))~.
• Adding a wildcard symbol may retrieve word variants: (( nhung thoi quy van. boi duong thuoc ma ) or ( nhung loi quy van. noi trung hoc mon ))*.