Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nghien huu » nghien cuu, nguyen huu, nhiem huu
hoc nhanh » hoc phan
gian lang » gian dan
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
hoc cac » hoc cao
cac hoi » cac thoi, cac khoi, cau hoi
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: thuoc sach hoc tap, nghien huu co ((hoc nganh) or (hoc nhanh)) khoa hoc cac hoi va gian lang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach hoc tap, nghien huu co ((hoc nganh) OR (hoc nhanh)) khoa hoc cac hoi va gian lang.
• Adding a wildcard symbol may retrieve word variants: thuoc sach hoc tap, nghien huu co ((hoc nganh) or (hoc nhanh)) khoa hoc cac hoi va gian lang*.