Perhaps you should try some spelling variations:
hoc nhanh » hoc phan
chau nhan » chan nhan, chau phan, ca nhan
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
hoi chau » hoi chu, hoi cham, hai chau
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
ma hoi » mai hoi, xa hoi, ma hoa

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