Perhaps you should try some spelling variations:
sach hay » sach han, sach ha, sach nay
sach kem » hanh kem
trinh do » trinh ky
nang xa » nang x, lang xa, nang ma
hieu ha » hieu hoa, hieu va, hieu ca
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
nam tu » nam thu, nam thuc
tu lap » truc lap
do cua » doi cua, co cua, de cua

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 hay) or (sach kem))) or (sac ky)) nang xa hoi. hieu ha nam tu lap trinh do cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach hay) OR (sach kem))) OR (sac ky)) nang xa hoi. hieu ha nam tu lap trinh do cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach hay) or (sach kem))) or (sac ky)) nang xa hoi. hieu ha nam tu lap trinh do cua tre*.