Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nganh khoa » nganh hoa, doanh khoa, anh khoa
sach hoc » cach hoc, sach hoi, mach hoc
van phan » van phong, van thanh, luan phan
tu sach » thu sach, su sach, te sach
cuu hoa » cuu khoa, cuu hoan, cau hoa
hoi van » hoi va, hoi dan, hai van
phan va » phan van, nhan va, han va
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: tu sach hoc tap, nghien cuu hoa hoc ((nganh khoa) OR (nganh khong)) hoc xa hoi van phan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu hoa hoc ((nganh khoa) OR (nganh khong)) hoc xa hoi van phan va".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu hoa hoc ((nganh khoa) OR (nganh khong)) hoc xa hoi van phan va*.