Perhaps you should try some spelling variations:
chong thuoc » khong thuoc, cong thuc, hong phuoc
nhoc nhanh » hoc nhanh, ngoc khanh, hoc nganh
nhoc nhan » ngoc nhan, hoc nhan, nhac nhan
sach hoc » cach hoc, sach hoi, mach hoc
thuoc ma » hoc ma, duoc ma
cau nhan » chau nhan, ca nhan, cu nhan
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
hoc cau » hoc cao, hoc cac, hoc can
ma hoc » va hoc, ma hoa, mo 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 cuu mo ((nhoc nhanh) OR (nhoc nhan)) chong thuoc ma hoc cau nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu mo ((nhoc nhanh) OR (nhoc nhan)) chong thuoc ma hoc cau nhan tai".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mo ((nhoc nhanh) OR (nhoc nhan)) chong thuoc ma hoc cau nhan tai*.