Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cuc ban » cac ban, cuu ban, duc ban
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
ky van » ly van, ty van, ky va
ve cam » ve cham, ve cac, va cam

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 van xay hoi. hieu ve cam ((cuc ban) or (cua ban)) hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky van xay hoi. hieu ve cam ((cuc ban) OR (cua ban)) hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky van xay hoi. hieu ve cam ((cuc ban) or (cua ban)) hanh vi ((cua tre) or (cuu tre))*.