Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
coc nganh » hoc nganh, cac nganh, chuc nganh
nganh hoa » thanh hoa, khanh hoa, danh hoa
thanh tai » thanh hai, thanh toan, doanh tai
thu sach » tu sach, thuat sach, thuoc sach
sach hoi » sach doi, sach moi, cach thoi
cong coc » cong cuoc, cong cac, cong co
hoi van » hoi dan, hai van, hoi han
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: thu sach hoi dap, nghien cua cong coc nganh hoa hoc xa ((hoi van) OR (hoi va)) thanh tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach hoi dap, nghien cua cong coc nganh hoa hoc xa ((hoi van) OR (hoi va)) thanh tai".
• Adding a wildcard symbol may retrieve word variants: thu sach hoi dap, nghien cua cong coc nganh hoa hoc xa ((hoi van) OR (hoi va)) thanh tai*.