Perhaps you should try some spelling variations:
hoc thanh » hoc nhanh, hoan thanh, hoc phan
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
tu mach » tu cach, tu manh, tu hach
nha dan » nhan dan, nhac dan, nha van
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 cuu cong hoc thanh cong hoc ((ma hoi) or (ma hoa)) cac nha dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu cong hoc thanh cong hoc ((ma hoi) OR (ma hoa)) cac nha dan.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu cong hoc thanh cong hoc ((ma hoi) or (ma hoa)) cac nha dan*.