Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nhanh khoa » nhan khoa, nganh khoa, hang khoa
hoc nhanh » hoc nganh, hoc phan
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
cau nhan » chau nhan, ca nhan, cu nhan
nhan van » nhan dan, nhan va, phan van
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi

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 thu cong hoc nhanh khoa hoc ((mai hoi) OR (dai hoi)) cau nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hoc tap, nghien thu cong hoc nhanh khoa hoc ((mai hoi) OR (dai hoi)) cau nhan van*".