Perhaps you should try some spelling variations:
hoan thanh » hoang thanh, ban thanh, van thanh
cong coc » cong cuoc, cong cac, cong co
dan nhan » danh nhan, dan chan, van nhan
nhan van » nhan dan, nhan va, phan van
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
mo hoan » moc hoang, hop hoan, ho khoan
hoi dan » hoa dan, hoc dan, hoi dap
coc xa » hoc xa, cac xa, coc ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) hoc tap, nghien cuu mo hoan thanh cong coc xa hoi dan nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) hoc tap, nghien cuu mo hoan thanh cong coc xa hoi dan nhan van".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) hoc tap, nghien cuu mo hoan thanh cong coc xa hoi dan nhan van*.