Perhaps you should try some spelling variations:
thuoc nganh » thuong nganh, hoc nganh, chuc nganh
cong thuoc » cong thuc, dong thuoc, long thuoc
nganh hoa » thanh hoa, khanh hoa, danh hoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
hoa phan » co phan
phan van » pham van, thanh van, luan van
tu mach » tu cach, tu manh, tu hach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu mach hoc tap, nghien cuu cong thuoc nganh hoa hoc ma ((hoa phan) OR (hoa dan)) phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu cong thuoc nganh hoa hoc ma ((hoa phan) OR (hoa dan)) phan van".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu cong thuoc nganh hoa hoc ma ((hoa phan) OR (hoa dan)) phan van*.