Perhaps you should try some spelling variations:
van thanh » ban thanh
cach hoc » cach thuc, cach thoi, dich hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoa » thong hoa, trong hoa, tong hop
hoa toan » hoa tan, hop toan, hoa than
khoa hoc » hoa hoc
van tuan » van quan, van ban, anh tuan
su cach » su sach, tu cach, su cac
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: su cach hoc tap, nghien cuu tong hoa toan khoa hoc xa hoi ((van thanh) or (van tuan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach hoc tap, nghien cuu tong hoa toan khoa hoc xa hoi ((van thanh) OR (van tuan)) van.
• Adding a wildcard symbol may retrieve word variants: su cach hoc tap, nghien cuu tong hoa toan khoa hoc xa hoi ((van thanh) or (van tuan)) van*.