Perhaps you should try some spelling variations:
doanh nhung » doanh chung, doanh thuong, doanh nhan
hoc doanh » hoa doanh, hoc danh, hoc dan
nhung hoc » chung hoc, nhung goc, khung hoc
khoa dang » khoa dung, hoa dan, hoa dong
dang phan » dung phan, nang phan, dang phat
thu mach » thuat mach, thu hoach, thuc cach
thu sach » tu sach, thuat sach, thuoc sach
bia khoa » da khoa
phan van » pham van, thanh van, luan van
hoc bia » hoc gia, hoc giao, hoc giai
mo hoc » mon hoc, co hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu mach) or (thu sach)) hoc tap, nghien cuu mo hoc doanh nhung hoc bia khoa dang phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu mach) OR (thu sach)) hoc tap, nghien cuu mo hoc doanh nhung hoc bia khoa dang phan van.
• Adding a wildcard symbol may retrieve word variants: ((thu mach) or (thu sach)) hoc tap, nghien cuu mo hoc doanh nhung hoc bia khoa dang phan van*.