Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
lai cua » dai cua, hai cua, lai chau
sach ty » sach y, sach tu, sach thu
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
lo van » le van, vo van, so van
ma hoi » mai hoi, xa hoi, me hoi
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: thu sach ty nang ((ma hoi) or (ma hoa)). hieu vu cham ((lo va) OR (lo van)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((ma hoi) OR (ma hoa)). hieu vu cham ((lo va) OR (lo van)) hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang ((ma hoi) or (ma hoa)). hieu vu cham ((lo va) OR (lo van)) hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((ma hoi) or (ma hoa)). hieu vu cham ((lo va) OR (lo van)) hanh lai cua tre*.