Perhaps you should try some spelling variations:
phan khong » phan hong, nhan khong, pham khong
thanh phan » thanh pho, thanh san, thanh toan
khong hoc » khung hoc, thong hoc, khong thuoc
dan thanh » dang thanh, danh thanh, ban thanh
hach hoc » cach hoc, mach hoc, hoach hoi
hoc phan » hoc dan, hoc pho
tu hach » tu hanh, tu cach, tu sach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, 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 hach hoc tap, nghien cuu mot hoc phan khong hoc ((ma hoi) OR (mai hoi)) dan thanh phan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu hach hoc tap, nghien cuu mot hoc phan khong hoc ((ma hoi) OR (mai hoi)) dan thanh phan".
• Adding a wildcard symbol may retrieve word variants: tu hach hoc tap, nghien cuu mot hoc phan khong hoc ((ma hoi) OR (mai hoi)) dan thanh phan*.