Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
doanh khoa » toan khoa
thanh toan » thanh hoa, thanh san, tinh toan
cach thoi » cac thoi, cach thuc, cach noi
hoc doanh » hoa doanh, hoc danh, hoc dan
van thanh » ban thanh, van tuan
sach hoi » sach doi, sach moi, hoach hoi
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
hai van » thai van, ha van, hai tan
ma hai » ta hai, va hai, xa hai

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 hoi) OR (cach thoi)) tai, nghien cua cong hoc doanh khoa hoc ma hai van thanh toan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach hoi) OR (cach thoi)) tai, nghien cua cong hoc doanh khoa hoc ma hai van thanh toan".
• Adding a wildcard symbol may retrieve word variants: su ((sach hoi) OR (cach thoi)) tai, nghien cua cong hoc doanh khoa hoc ma hai van thanh toan*.