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
cuu cong » cua cong, thu cong, cac cong
vu sach » vu bach, su sach, vu khach
moi tap » moi tai, toi tap
moi dan » moi dang, doi dan, loi dan
hoi dan » hoa dan, hoc dan, hoi dap
hai van » thai van, ha van, hai tan
va hai » van hai, va chai, va khai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach moi tap, nghien cuu cong ((moi dan) OR (hoi dan)) hoa hoc va hai van thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach moi tap, nghien cuu cong ((moi dan) OR (hoi dan)) hoa hoc va hai van thanh van".
• Adding a wildcard symbol may retrieve word variants: vu sach moi tap, nghien cuu cong ((moi dan) OR (hoi dan)) hoa hoc va hai van thanh van*.