Perhaps you should try some spelling variations:
nang chat » nang phat, nang cham, nang cao
cham thuc » nham thuc, pham thuc, tham thuc
chat hoc » chat hoa, chat thom, cho hoc
thuc day » thuc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
day dan » day danh, dao dan, cay dan
can cau » van cau, ban cau, cac cau
ca cau » cua cau, cac cau, ca cac

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 ky nang chat hoc. hieu ve cham thuc day dan ((ca cau) or (can cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang chat hoc. hieu ve cham thuc day dan ((ca cau) OR (can cau)) tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang chat hoc. hieu ve cham thuc day dan ((ca cau) or (can cau)) tren*.