Perhaps you should try some spelling variations:
phan thong » phan thuong, phan hong, phan tong
thong phan » thong quan, chong phap, thong van
mach hoc » cach hoc, dich hoc, anh hoc
hoc phan » hoc dan, hoc pho
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
tu mach » tu cach, tu manh, tu hach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
phan xa » phan xay, phan ba, phan ha
hoi tap » hoi dap, hoi tai, hai tap

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 phan thong phan xa hoi tap ((toan tai) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu mot hoc phan thong phan xa hoi tap ((toan tai) OR (toan ban))*".