Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
nhanh khoa » nhan khoa, nganh khoa, hang khoa
coc nhanh » hoc nhanh, doc nhanh, cach nhanh
thu sach » thuat sach, thuoc sach, thu hoach
cac cong » cua cong
cong coc » cong cuoc, cong cac, cong co
khoa hoc » hoa hoc
tu sach » su sach, te sach, tu cach
hoi tap » hoi dap, hoc tap, hoi tai
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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 (thu sach)) hoi tap, nghien cac cong coc nhanh khoa hoc xa hoi ca nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) hoi tap, nghien cac cong coc nhanh khoa hoc xa hoi ca nhan va".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) hoi tap, nghien cac cong coc nhanh khoa hoc xa hoi ca nhan va*.