Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
nganh cong » nhanh chong, thanh cong
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
hoi tai » hoc tai, hoi trac
tai tap » bai tap, tai tao, hai tap
tap tai » thap tai, lap tai, tap bai
ma hoi » mai hoi, 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 ((sach hoc) or (mach hoc)) tap, nghien cac cong hoc nganh cong hoc ma hoi tai tap tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (mach hoc)) tap, nghien cac cong hoc nganh cong hoc ma hoi tai tap tai.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (mach hoc)) tap, nghien cac cong hoc nganh cong hoc ma hoi tai tap tai*.