Perhaps you should try some spelling variations:
cong thuoc » cong thuc, dong thuoc, long thuoc
cach thuc » anh thuc, cac thu
thuoc dan » thuoc dang, thuc dan, thuoc ban
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu cong » cua cong, thu cong, cac cong
phan dan » phan dang, phan dau, nhan dan
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((cach thuc) or (dich hoc)) tap, nghien cuu cong thuoc dan hoa hoc ma hoi va phan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((cach thuc) OR (dich hoc)) tap, nghien cuu cong thuoc dan hoa hoc ma hoi va phan dan.
• Adding a wildcard symbol may retrieve word variants: su ((cach thuc) or (dich hoc)) tap, nghien cuu cong thuoc dan hoa hoc ma hoi va phan dan*.