Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
loc va » hoc va, luc 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 ky nang ma hoa. ((hieu ve) or (hieu va)) cau ((duc va) or (loc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ma hoa. ((hieu ve) OR (hieu va)) cau ((duc va) OR (loc va)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ma hoa. ((hieu ve) or (hieu va)) cau ((duc va) or (loc va)) hanh vai cua tre*.