Perhaps you should try some spelling variations:
nganh xay » nganh mac, nganh y, nganh ma
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
xuc ban » cuc ban, quoc ban, xuat ban
hoi cua » hoi chuc
anh hoi » anh noi, anh hoc, anh khoa
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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