Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
sach thuc » cach thuc, sach thu, sach thue
thuc thai » thuc pham, toc thai, thuc thuc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
so sach » so sanh, bo sach, co sach
hoc xa » hoc ma
xa va » xua va, xa van, ca va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thuc thai, nghien cuu toan hoc ((nganh nong) or (nganh cong)) hoc xa va van nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thuc thai, nghien cuu toan hoc ((nganh nong) OR (nganh cong)) hoc xa va van nhan dan.
• Adding a wildcard symbol may retrieve word variants: so sach thuc thai, nghien cuu toan hoc ((nganh nong) or (nganh cong)) hoc xa va van nhan dan*.