Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
dac thanh » dao thanh, duc thanh, bac thanh
toc sach » hoc sach, doc sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cong dac » cong tac, cong dan, cong cac
cong hoc » dong hoc, cong hoa, cong coc
nhan van » nhan dan, phan van, nha van
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma

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 tap, nghien thu cong dac thanh cong hoc xa hoi va ((nhan van) OR (nhan va))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach hoc tap, nghien thu cong dac thanh cong hoc xa hoi va ((nhan van) OR (nhan va))".
• Adding a wildcard symbol may retrieve word variants: toc sach hoc tap, nghien thu cong dac thanh cong hoc xa hoi va ((nhan van) OR (nhan va))*.