Perhaps you should try some spelling variations:
phan thong » phan thuong, phan hong, phan tong
thong hoc » thuong hoc, tuong hoc, thong hoa
gian dan » gian lang
van gian » van giang, dan gian, van giao
hoc phan » hoc dan, hoc pho
hoi van » hoi va, hoi dan, hai van
dai hoi » dai hoc, dai hai, dai moi
hoc dai » hoc dan
so sach » so sanh, bo sach, co sach
cuu mon » cuu mo, cuu mot, cuu cong
doi tai » hoi tai, dai tai, doi tac
doi dap » hoi dap, doi dau, do dap
mon hoc » toan hoc, dong hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((doi dap) or (doi tai)), nghien cuu mon hoc phan thong hoc dai hoi van gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((doi dap) OR (doi tai)), nghien cuu mon hoc phan thong hoc dai hoi van gian dan*.