Perhaps you should try some spelling variations:
nhanh hung » thanh hung, nhanh hong, nhanh chuong
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoc nhanh » hoc nganh, hoc phan
tinh son » tinh toan, dinh so, tinh hoc
cac thoi » cac toi, cac hop, cac tro
sach hoc » cach hoc, sach hoi, mach hoc
hung hoc » chung hoc, khung hoc, nhung hoc
cong hoc » dong hoc, cong hoa, cong coc
cac cong » cua cong
mai hoi » mai khoi, dai hoi, lai hoi
va tinh » may tinh
tu sach » thu sach, su sach, te sach

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 cac cong hoc nhanh hung hoc ((mai hoi) or (cac thoi)) va tinh son~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cac cong hoc nhanh hung hoc ((mai hoi) OR (cac thoi)) va tinh son.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cac cong hoc nhanh hung hoc ((mai hoi) or (cac thoi)) va tinh son*.