Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
nham thuc » nhan thuc, nam thuc, nham thu
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
day hanh » day thanh, dao hanh, day manh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
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 van 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 van 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 van nham thuc ((day hanh) or (day nhanh)) de ((cua tre) or (cua te))*.