Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
thanh toan » thanh hoa, thanh san, tinh toan
hoc doanh » hoa doanh, hoc danh, hoc dan
van thanh » ban thanh, van tuan
sach hoi » sach doi, sach moi, cach thoi
cong hoc » dong hoc, cong hoa, cong coc
nhan hoc » nha hoc, than hoc, nhan thuc
nhan hoa » nhan khoa, phan hoa, thanh hoa
su sach » so sach, vu sach
hoi tai » hoc tai, hoi trac
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 tai, nghien cua cong hoc doanh ((nhan hoc) OR (nhan hoa)) ma hai van thanh toan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoi tai, nghien cua cong hoc doanh ((nhan hoc) OR (nhan hoa)) ma hai van thanh toan".
• Adding a wildcard symbol may retrieve word variants: su sach hoi tai, nghien cua cong hoc doanh ((nhan hoc) OR (nhan hoa)) ma hai van thanh toan*.