Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoa doanh » hoa dan
tuong hoc » truong hoc, tuong ho, duong hoc
sach moi » sach doi, sach hoi, bach mai
tai toan » bai toan, tap toan, tai tuan
toan tai » toan tap, doanh tai, toan ban
su sach » so sach, vu sach
moi tai » mo tai, moi thoi, phoi tai
hoi tai » hoc tai, hoi trac
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 moi tai, nghien thu cong ((hoa doanh) or (toan doanh)) tuong hoc xa hoi tai toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach moi tai, nghien thu cong ((hoa doanh) OR (toan doanh)) tuong hoc xa hoi tai toan tai.
• Adding a wildcard symbol may retrieve word variants: su sach moi tai, nghien thu cong ((hoa doanh) or (toan doanh)) tuong hoc xa hoi tai toan tai*.