Perhaps you should try some spelling variations:
thuoc nganh » thuong nganh, hoc nganh, chuc nganh
cong thuoc » cong thuc, dong thuoc, long thuoc
cach thoi » cac thoi, cach thuc, cach noi
nganh hoa » thanh hoa, khanh hoa, danh hoa
phan phan » phap phan, phan phat, than phan
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
hoa phan » hoa dan, co phan
phan van » pham van, thanh van, luan van

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 hoc) or (cach thoi)) tap, nghien cuu cong thuoc nganh hoa hoc ma hoa phan phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (cach thoi)) tap, nghien cuu cong thuoc nganh hoa hoc ma hoa phan phan van.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (cach thoi)) tap, nghien cuu cong thuoc nganh hoa hoc ma hoa phan phan van*.