Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
xuc ban » duc ban, cuc ban, quoc ban
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
di cuu » di cau, di cua, dinh cuu

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