Perhaps you should try some spelling variations:
phan khong » phan hong, nhan khong, pham khong
khong hoc » khung hoc, thong hoc, khong thuoc
mai khoi » mai khoa, tai khoa, cac khoi
dai khoi » dai hoi, dai khoa, dai kho
sach hoi » sach doi, sach moi, cach thoi
nhan dan » phan dau, gian dan, nhan tai
hoc phan » hoc dan, hoc pho
tong hoc » tuong hoc, thong hoc, trong hoc
cuu tong » cuu cong, cuu tinh, huu tung
hoi tap » hoi dap, hoc tap, hoi tai
va nhan » van nhan, ca nhan, va phan
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach hoi tap, nghien cuu tong hoc phan khong hoc ((dai khoi) or (mai khoi)) va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoi tap, nghien cuu tong hoc phan khong hoc ((dai khoi) OR (mai khoi)) va nhan dan.
• Adding a wildcard symbol may retrieve word variants: te sach hoi tap, nghien cuu tong hoc phan khong hoc ((dai khoi) or (mai khoi)) va nhan dan*.