Perhaps you should try some spelling variations:
hoc nhanh » hoc phan
sach hoc » cach hoc, sach hoi, mach hoc
van nhan » van phan, van thanh, danh nhan
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
hoa van » hoa dan, hoang van, hoa phan

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)) hoa hoc ma hoa van nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu mot ((hoc nganh) OR (hoc nhanh)) hoa hoc ma hoa van nhan tai".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mot ((hoc nganh) OR (hoc nhanh)) hoa hoc ma hoa van nhan tai*.