Perhaps you should try some spelling variations:
phan khong » phan hong, nhan khong, pham khong
thanh toan » thanh hoa, thanh san, tinh toan
khong hoc » khung hoc, thong hoc, khong thuoc
goc phan » ngoc phan, hoc phan, gop phan
anh hoc » sinh hoc, benh hoc, hinh hoc
cuu mot » cua mot, cuu mo, huu mot
hoc mai » hoc ma, hoc dai, hoc bai
hoi dan » hoc dan, hoi dap, thoi dai
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 mot goc phan khong hoc mai ((hoi dan) or (hoa dan)) thanh toan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu anh hoc tap, nghien cuu mot goc phan khong hoc mai ((hoi dan) OR (hoa dan)) thanh toan.
• Adding a wildcard symbol may retrieve word variants: tu anh hoc tap, nghien cuu mot goc phan khong hoc mai ((hoi dan) or (hoa dan)) thanh toan*.