Perhaps you should try some spelling variations:
phan thong » phan thuong, phan hong, phan tong
thanh phan » thanh san, thanh toan, thanh hai
thong hoc » thuong hoc, tuong hoc, thong hoa
mach hoc » cach hoc, dich hoc, anh hoc
hoc phan » hoc dan, hoc pho
tu mach » tu cach, tu manh, tu hach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
hoi dan » hoa dan, hoc dan, hoi dap
ma hoi » mai hoi, 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 hoc phan thong hoc ma hoi dan ((thanh phan) OR (thanh pho))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu mot hoc phan thong hoc ma hoi dan ((thanh phan) OR (thanh pho))".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu mot hoc phan thong hoc ma hoi dan ((thanh phan) OR (thanh pho))*.