Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoc thanh » hoan thanh, hoc phan, ha thanh
hoc nhanh » hoc nganh, hoc phan
sach toi » sach doi, sach hoi, sach moi
cac cong » cua cong
cong hoa » dong hoa, dong hoc, hang hoa
su sach » so sach, vu sach
toi tap » toi gap, toan tap, tong tap
va nhan » van nhan, ca nhan, va phan
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 toi tap, nghien cac cong ((hoc thanh) or (hoc nhanh)) cong hoa xa hoi va nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach toi tap, nghien cac cong ((hoc thanh) OR (hoc nhanh)) cong hoa xa hoi va nhan va.
• Adding a wildcard symbol may retrieve word variants: su sach toi tap, nghien cac cong ((hoc thanh) or (hoc nhanh)) cong hoa xa hoi va nhan va*.