Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
khong hoc » khung hoc, khong thuoc, khong chuc
thong hoc » thuong hoc, tuong hoc, thong hoa
dan thanh » dang thanh, danh thanh, ban thanh
hoc phan » hoc dan, hoc pho
anh hoc » sinh hoc, benh hoc, hinh hoc
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
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 mot hoc phan ((khong hoc) OR (thong hoc)) mai hoi dan thanh phan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu anh hoc tap, nghien cuu mot hoc phan ((khong hoc) OR (thong hoc)) mai hoi dan thanh phan".
• Adding a wildcard symbol may retrieve word variants: tu anh hoc tap, nghien cuu mot hoc phan ((khong hoc) OR (thong hoc)) mai hoi dan thanh phan*.