Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
nham thuc » nhan thuc, nam thuc, nham thu
day hanh » day thanh, dao hanh, day manh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x ho. hieu ve nham thuc ((day hanh) or (day nhanh)) de ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x ho. hieu ve nham thuc ((day hanh) OR (day nhanh)) de ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x ho. hieu ve nham thuc ((day hanh) or (day nhanh)) de ((cua tre) or (cua te))*.