Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
sach hoi » sach doi, sach moi, cach thoi
gian dan » gian lang
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
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: tu sach hoi tap, nghien cuu mon hoc nganh ((khoa hoc) or (hoa hoc)) xa hoi va gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien cuu mon hoc nganh ((khoa hoc) OR (hoa hoc)) xa hoi va gian dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien cuu mon hoc nganh ((khoa hoc) or (hoa hoc)) xa hoi va gian dan*.