Perhaps you should try some spelling variations:
nghien chuc » nghien cuu, nghiem thuc, nghiep thuc
nang thuoc » dang thuoc, nang thuc, sang thuoc
cach thoi » cac thoi, cach thuc, cach noi
thuoc dan » thuoc dang, thuc dan, thuoc ban
thoi tap » toi tap, hoc tap, thoi dai
phan dan » phan dang, phan dau, nhan dan
su cach » su sach, tu cach, su cac
dan hoa » danh hoa, dan hoat, dan khoa
va phan » van phan, va phat, va phap
ma hoi » mai hoi, xa hoi, ma hoa

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

• Adding a wildcard symbol may retrieve word variants: su cach thoi tap, nghien chuc nang thuoc dan hoa hoc ma hoi va phan dan*.