Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
day nhanh » day thanh, duy nhanh, dac nhan
day hanh » day thanh, dao hanh, day manh
sach ky » sac ky, sach ty, sach kem
ve nham » ve nha, ve cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ky) OR (sach y)) nang x hoi. hieu ve nham thuc ((day hanh) or (day nhanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach y)) nang x hoi. hieu ve nham thuc ((day hanh) OR (day nhanh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) OR (sach y)) nang x hoi. hieu ve nham thuc ((day hanh) or (day nhanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) OR (sach y)) nang x hoi. hieu ve nham thuc ((day hanh) or (day nhanh)) de cua tre*.