Perhaps you should try some spelling variations:
doanh thuong » doan phuong, anh thuong, dinh thuong
doanh tuong » doanh tong, doanh trong, doan cuong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
sach phoi » sach hoi, cach thoi, sach doi
toan tai » toan tap, doanh tai, toan ban
phoi tai » hoi tai, phi tai, pham tai
thu hang » thi hang, thuc hanh, thu huong
hang hoa » hang khoa, thanh hoa, hang va
bai toan » bai tap
hoc bai » hoc dai, hoc giai
su sach » so sach, vu sach
xa hoc » xa hoi, va hoc, xa hoa
hoc xa » hoc ma

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 phoi tai, nghien thu hang hoa ((doanh tuong) or (doanh thuong)) hoc xa hoc bai toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach phoi tai, nghien thu hang hoa ((doanh tuong) OR (doanh thuong)) hoc xa hoc bai toan tai.
• Adding a wildcard symbol may retrieve word variants: su sach phoi tai, nghien thu hang hoa ((doanh tuong) or (doanh thuong)) hoc xa hoc bai toan tai*.