Perhaps you should try some spelling variations:
tuan dai » toan dai, tuan tai, quang dai
soc dan » hoc dan, so dan, sac dan
vu cham » va cham, vu kham, tu cham
sach ty » sach tu, sach thu, xach tay
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
oc van » hoc van, luoc van, quoc van

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 ty) or (sach y)) nang ma hoi. hieu vu cham ((soc dan) or (oc van)) tuan dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ma hoi. hieu vu cham ((soc dan) OR (oc van)) tuan dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang ma hoi. hieu vu cham ((soc dan) or (oc van)) tuan dai cua tre*.