Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
phan cong » thanh cong
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 cong hoc xa hai van thanh san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach hoc) OR (cach hoc)) tap, nghien thu cong hoc phan cong hoc xa hai van thanh san.
• Adding a wildcard symbol may retrieve word variants: toc ((sach hoc) or (cach hoc)) tap, nghien thu cong hoc phan cong hoc xa hai van thanh san*.