Perhaps you should try some spelling variations:
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
san khoa » toan khoa, hang khoa, da khoa
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc san » hoc dan, toc san, hoc can
va nhan » van nhan, ca nhan, va phan
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) OR (cach hoc)) tap, nghien cuu mon hoc san khoa hoc xa hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach hoc) OR (cach hoc)) tap, nghien cuu mon hoc san khoa hoc xa hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: toc ((sach hoc) OR (cach hoc)) tap, nghien cuu mon hoc san khoa hoc xa hoi va nhan dan*.