Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tai roi » lai roi, tai hoi, toan roi
tai loi » thai loi, tai hoi, tat loi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
luc va » tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((tai roi) or (tai loi)). hieu ve cam ((luc va) OR (duc va)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((tai roi) OR (tai loi)). hieu ve cam ((luc va) OR (duc va)) hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((tai roi) or (tai loi)). hieu ve cam ((luc va) OR (duc va)) hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((tai roi) or (tai loi)). hieu ve cam ((luc va) OR (duc va)) hanh dai cua tre*.