Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
nhanh khoa » nhan khoa, nganh khoa, hang khoa
hoc nhanh » hoc nganh, hoc phan
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
cau toi » cau hoi, cau thi, cac toi
toi tap » toi gap, toan tap, tong tap
nhan va » nhan tai, nhan dan, nhan tao
van tai » von tai, van tuan
tu cau » tu cac, cu cau, tu can
hoc xa » hoc ma
xa hoa » xa khoa, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cau toi tap, nghien cac cong hoc nhanh khoa hoc xa hoa dan ((nhan va) or (van tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cau toi tap, nghien cac cong hoc nhanh khoa hoc xa hoa dan ((nhan va) OR (van tai)).
• Adding a wildcard symbol may retrieve word variants: tu cau toi tap, nghien cac cong hoc nhanh khoa hoc xa hoa dan ((nhan va) or (van tai))*.