Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
toc sach » hoc sach, doc sach, thuoc sach
khoa hoc » hoa hoc
van pham » san pham, van phan, van phat
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.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((hoi tap) OR (hoi dap)), nghien cuu khoa hoc nganh khoa hoc xa hoi van pham van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((hoi tap) OR (hoi dap)), nghien cuu khoa hoc nganh khoa hoc xa hoi van pham van".
• Adding a wildcard symbol may retrieve word variants: toc sach ((hoi tap) OR (hoi dap)), nghien cuu khoa hoc nganh khoa hoc xa hoi van pham van*.