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
van gian » van giang, dan gian, van giao
gian dan » gian lang
co sach » bo sach, cuon sach, hoc 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
hoi van » hoi va, hoi dan, hai van

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

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