Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
sach doi » sach hoi, sach moi, sach dao
phan hoa » phan loai, phan phoi, phan hong
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
doi dap » hoi dap, doi dau, do dap
mon hoc » toan hoc, dong hoc
mo hoc » co hoc
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: te sach doi dap, nghien cuu ((mo hoc) OR (mon hoc)) phan hoa hoc xa hoi va thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach doi dap, nghien cuu ((mo hoc) OR (mon hoc)) phan hoa hoc xa hoi va thanh van".
• Adding a wildcard symbol may retrieve word variants: te sach doi dap, nghien cuu ((mo hoc) OR (mon hoc)) phan hoa hoc xa hoi va thanh van*.