Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh van » thanh san, thanh toan, thanh phan
sach moi » sach doi, sach hoi, bach mai
hoc phan » hoc dan
phoi hoc » hoi hoc, phoi thuoc, hoa hoc
te sach » toc sach
moi dap » hoi dap, doi dap, moi dan
hoi van » hoi va, hoi dan, hai van
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 moi dap, nghien cuu mo ((hoc phan) or (hoc pho)) phoi hoc xa hoi van thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach moi dap, nghien cuu mo ((hoc phan) OR (hoc pho)) phoi hoc xa hoi van thanh van.
• Adding a wildcard symbol may retrieve word variants: te sach moi dap, nghien cuu mo ((hoc phan) or (hoc pho)) phoi hoc xa hoi van thanh van*.