Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
te sach » toc sach
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (tu sach)) ky nang cau hoi. hieu ve cau ((duc va) or (truc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (tu sach)) ky nang cau hoi. hieu ve cau ((duc va) OR (truc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (tu sach)) ky nang cau hoi. hieu ve cau ((duc va) or (truc va)) hanh vi cua tre*.