Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
sach doi » sach hoi, sach dao, sach bai
sach moi » sach hoi, bach mai, sach bai
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
cam chan » cam nhan, dan chan
chan tai » nhan tai, han tai, chan hai
hoi cam » hoi cham, hoi cac, hoi cau
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: tu ((sach doi) or (sach moi)) tap, nghien thu cong hoc nganh khoa hoc xa hoi cam chan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach doi) OR (sach moi)) tap, nghien thu cong hoc nganh khoa hoc xa hoi cam chan tai.
• Adding a wildcard symbol may retrieve word variants: tu ((sach doi) or (sach moi)) tap, nghien thu cong hoc nganh khoa hoc xa hoi cam chan tai*.