Perhaps you should try some spelling variations:
phan khong » phan hong, nhan khong, pham khong
thanh phan » thanh pho, thanh toan, thanh hai
khong hoc » khung hoc, thong hoc, khong thuoc
hoc phan » hoc dan, hoc pho
anh hoc » sinh hoc, benh hoc, hinh hoc
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
hoi dan » hoa dan, hoc dan, hoi dap
tu anh » tu hanh, tu manh, thu anh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu anh hoc tap, nghien cuu mon hoc phan khong hoc mai hoi dan ((thanh phan) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu anh hoc tap, nghien cuu mon hoc phan khong hoc mai hoi dan ((thanh phan) OR (thanh san)).
• Adding a wildcard symbol may retrieve word variants: tu anh hoc tap, nghien cuu mon hoc phan khong hoc mai hoi dan ((thanh phan) or (thanh san))*.