Perhaps you should try some spelling variations:
nhanh chong » thanh cong, khanh phong
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoa nhanh » hoc nhanh, hoa thanh, hoa khanh
chong hoc » chung hoc, chong doc, thong hoc
mach hoc » cach hoc, dich hoc, anh hoc
cac cong » cua cong
cong hoa » dong hoa, dong hoc, hang hoa
cac nhan » ca nhan, cac nha, cam nhan
nhan dan » phan dau, gian dan, nhan tai
tu mach » tu cach, tu manh, tu hach
ma hoi » mai hoi, xa hoi, 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 nhanh chong hoc ((ma hoi) or (ma hoa)) cac nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cac cong hoa nhanh chong hoc ((ma hoi) OR (ma hoa)) cac nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cac cong hoa nhanh chong hoc ((ma hoi) or (ma hoa)) cac nhan dan*.