Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh cong » nhanh chong, thanh cong
cong thuoc » cong thuc, dong thuoc, long thuoc
hoa nganh » hoc nganh, khoi nganh, hoa doanh
ban mach » ban sach, ranh mach, ban hanh
mach hoc » cach hoc, dich hoc, anh hoc
cong hoa » dong hoa, dong hoc, hang hoa
thuoc va » thuc va, thuoc ma, thuong va
phan van » pham van, thanh van, luan van
nha van » nha lanh
va hoa » van hoa, va hoc, ma hoa
hoa ca » hoa cua, hoa cac, hoa cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ban mach hoc tap, nghien thu cong hoa nganh cong thuoc va hoa ca ((nha van) or (phan van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ban mach hoc tap, nghien thu cong hoa nganh cong thuoc va hoa ca ((nha van) OR (phan van)).
• Adding a wildcard symbol may retrieve word variants: ban mach hoc tap, nghien thu cong hoa nganh cong thuoc va hoa ca ((nha van) or (phan van))*.