Perhaps you should try some spelling variations:
nhanh khoa » nhan khoa, nganh khoa, hang khoa
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoc nhanh » hoc nganh, hoc phan
phan dau » phan tu, hang dau
cau phan » chau phan, cuu phan, cac phan
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
dong hoc » dong co, dong luc
cac dong » cac duong, cac cong, cac dang
tu sach » thu sach, su sach, te sach
xa hoc » xa hoi, xa hoa, ta hoc
va hoc » van hoc

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 hoc tap, nghien cac dong hoc nhanh khoa hoc ((xa hoc) OR (va hoc)) cau phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cac dong hoc nhanh khoa hoc ((xa hoc) OR (va hoc)) cau phan dau".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cac dong hoc nhanh khoa hoc ((xa hoc) OR (va hoc)) cau phan dau*.