Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
gian dan » gian lang
so sach » so sanh, bo sach, co sach
cuu mon » cuu mo, cuu cong, cuu tong
cuu mot » cua mot, cuu mo, huu mot
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va gian » va gianh, van gian, va giai

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 hoc tap, nghien ((cuu mon) or (cuu mot)) hoc nganh khoa hoc mai hoi va gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoc tap, nghien ((cuu mon) OR (cuu mot)) hoc nganh khoa hoc mai hoi va gian dan.
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien ((cuu mon) or (cuu mot)) hoc nganh khoa hoc mai hoi va gian dan*.