Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
nano cau » nang cau, bang cau, nano va
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van lam » van nam
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
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: tu sach truc nano cau hoi. hieu van lam ((cuc ban) OR (cuu van)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach truc nano cau hoi. hieu van lam ((cuc ban) OR (cuu van)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach truc nano cau hoi. hieu van lam ((cuc ban) OR (cuu van)) hanh vi cua tre*.