Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
phan cung » phan cong, phan ung, phan xuong
mach hoc » cach hoc, dich hoc, anh hoc
cac cong » cua cong
cong hoa » dong hoa, dong hoc, hang hoa
hoa phan » hoa dan, co phan
cung hoc » chung hoc, dung hoc, vung hoc
nhan tao » nhan tai, nhan dan
tu mach » tu cach, tu manh, tu hach
mai hoi » mai khoi, dai hoi, lai hoi
va nhan » van nhan, ca nhan, va phan
ma hoi » xa hoi, ma hoa, me hoi

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 cac cong hoa phan cung hoc ((ma hoi) OR (mai hoi)) va nhan tao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cac cong hoa phan cung hoc ((ma hoi) OR (mai hoi)) va nhan tao".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cac cong hoa phan cung hoc ((ma hoi) OR (mai hoi)) va nhan tao*.