Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
thu sach » tu sach, thuat sach, thuoc sach
cong coc » cong cuoc, cong cac, cong co
coc danh » hoc danh, cuon danh, chuc danh
danh hoa » thanh hoa, khanh hoa, nganh hoa
hoi tap » hoc tap, hoi tai, hai tap
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((hoi tap) OR (hoi dap)), nghien cua cong coc danh hoa hoc xa hoi van thanh tai~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((hoi tap) OR (hoi dap)), nghien cua cong coc danh hoa hoc xa hoi van thanh tai*.