Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
cua tinh » cua sinh, va tinh, ha tinh
tinh van » trinh van, dinh van, tinh va
tu mach » tu cach, tu manh, tu hach
cuu mot » cua mot, huu mot, cuu vuot
hoa cua » hoa chat, hoa xuat
hoc xa » hoc ma
xa hoa » xa khoa, xa hoi, ma hoa

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 mot) or (cuu mo)) hoc dan khoa hoc xa hoa cua tinh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien ((cuu mot) OR (cuu mo)) hoc dan khoa hoc xa hoa cua tinh van.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien ((cuu mot) or (cuu mo)) hoc dan khoa hoc xa hoa cua tinh van*.