Perhaps you should try some spelling variations:
nghiem thuc » nghiem thuoc, nghiep thuc, nhiem thuc
thuc cong » thuoc cong, thu cong, chuc cong
doc thanh » duoc thanh, hoc thanh, duc thanh
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
cong doc » chong doc, cong coc, cong dac
cong hoc » dong hoc, cong hoa, cong coc
nhan van » nhan dan, nhan va, phan van
va nhan » van nhan, ca nhan, va phan
hoa va » hoa van, hoa xa, hoa vo

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, nghiem thuc cong doc thanh cong hoc ma hoa va nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach hoc) OR (cach hoc)) tap, nghiem thuc cong doc thanh cong hoc ma hoa va nhan van*.