Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
dan khoa » dang khoa, da khoa, san khoa
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, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
ho cua » hoc cua, hoi cua, hoa cua

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