Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
sach hoi » sach doi, sach moi, cach thoi
cuu toan » cuu hoan, cua toan, huu toan
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach
va phan » van phan, va phat, va phap
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 hoi dap, nghien ((cuu toan) or (cuu van)) hoc nganh khoa hoc xa hoi va phan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi dap, nghien ((cuu toan) OR (cuu van)) hoc nganh khoa hoc xa hoi va phan va.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi dap, nghien ((cuu toan) or (cuu van)) hoc nganh khoa hoc xa hoi va phan va*.