Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
ty nang » ky nang, ty hang, ly nang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
lo van » le van, vo van, so van
lo va » lao va, ly va, le va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((ty nang) or (ty xang)) ma hoi. hieu vu cham ((lo va) or (lo van)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ty nang) OR (ty xang)) ma hoi. hieu vu cham ((lo va) OR (lo van)) hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ty nang) or (ty xang)) ma hoi. hieu vu cham ((lo va) or (lo van)) hanh thai cua tre*.