Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
phan chong » phan cong, phan hong, phap chong
thanh toan » thanh hoa, thanh san, tinh toan
chong hoc » chung hoc, chong doc, thong hoc
van thanh » ban thanh, van tuan
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
cong hoc » dong hoc, cong hoa, cong coc
hoc phan » hoc dan, hoc pho
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach hoc) OR (cach hoc)) tap, nghien thu cong hoc phan chong hoc xa hai van thanh toan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach hoc) OR (cach hoc)) tap, nghien thu cong hoc phan chong hoc xa hai van thanh toan".
• Adding a wildcard symbol may retrieve word variants: toc ((sach hoc) OR (cach hoc)) tap, nghien thu cong hoc phan chong hoc xa hai van thanh toan*.