Perhaps you should try some spelling variations:
phan thong » phan thuong, phan hong, phan tong
thong hoc » thuong hoc, tuong hoc, thong hoa
van nhan » van phan, van thanh, danh nhan
hoc phan » hoc dan, hoc pho
su sach » so sach, vu sach
hai van » thai van, ha van, hai tan
mai hai » mai thai, dai hai, mai mai
hoc mai » hoc ma, hoc dai, hoc bai
mon hoc » toan hoc, dong hoc
cuu mon » cuu mo, cuu mot, cuu cong
doi tai » hoi tai, dai tai, doi tac
doi dap » hoi dap, doi dau, do dap
nhan va » nhan tai, nhan dan, nhan tao

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

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