Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
xuc ban » cuc ban, quoc ban, xuat ban
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 ky) or (sac ky)) nang x hoi. hieu ve cam ((xuc ban) OR (duc ban)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. hieu ve cam ((xuc ban) OR (duc ban)) thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang x hoi. hieu ve cam ((xuc ban) OR (duc ban)) thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x hoi. hieu ve cam ((xuc ban) OR (duc ban)) thanh vi cua tre*.