Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
hoc nganh » hoc nhanh
sach doi » sach moi, sach dao, sach bai
sach hoi » sach moi, cach thoi, hoach hoi
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
cong hoc » cong hoa, cong coc, cong ho
cua nhan » ca nhan, cua ngan, cua nha
nhan dan » phan dau, gian dan, nhan tai
hoi cua » hoi chuc
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: vu ((sach doi) OR (sach hoi)) thoi, nghien cuu dong hoc nganh cong hoc ma hoi cua nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach doi) OR (sach hoi)) thoi, nghien cuu dong hoc nganh cong hoc ma hoi cua nhan dan".
• Adding a wildcard symbol may retrieve word variants: vu ((sach doi) OR (sach hoi)) thoi, nghien cuu dong hoc nganh cong hoc ma hoi cua nhan dan*.