Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
thanh va » thanh van, hanh va, thanh ha
dang xay » dang van, van xay
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
ve cac » va cac
lo ban » co ban, lo van, ly ban
va cua » va chua, via cua, ca cua

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 cac) or (vien cac)) lo ban thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky dang xay hoi. hieu ((ve cac) OR (vien cac)) lo ban thanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky dang xay hoi. hieu ((ve cac) or (vien cac)) lo ban thanh va cua tre*.