Perhaps you should try some spelling variations:
cach thoi » cach thuc, cach noi
hoi doanh » hoa doanh, voi doanh, doi doanh
cac thoi » cac toi, cac hop, cac tro
nhan van » nhan dan, nhan va, phan van
hoc tan » hoc tang, hoc dan, hoc tap
tan hoa » van hoa, tap hoa, tan ha
cuu co » huu co, cua co, cuu mo
hoc xa » hoc ma

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((cach thoi) OR (cac thoi)) tap, nghien cuu co hoc tan hoa hoc xa hoi doanh nhan van~".
• Adding a wildcard symbol may retrieve word variants: vu ((cach thoi) OR (cac thoi)) tap, nghien cuu co hoc tan hoa hoc xa hoi doanh nhan van*.