Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
sach hoi » sach doi, sach moi, cach thoi
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
coc toan » ngoc toan, coc khoan, quoc toan
khoa hoc » hoa hoc
phan van » pham van, luan van, tran van
su sach » so sach, vu sach
hoi tap » hoi dap, hoc tap, hoi tai
hoi cac » hoc cac, voi cac, hoa 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 sach hoi tap, nghien cuu cong coc toan khoa hoc xa hoi cac ((phan van) or (thanh van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoi tap, nghien cuu cong coc toan khoa hoc xa hoi cac ((phan van) OR (thanh van)).
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien cuu cong coc toan khoa hoc xa hoi cac ((phan van) or (thanh van))*.