Perhaps you should try some spelling variations:
chai cua » chat cua, thai cua, chi cua
dang xay » dang van, van xay
ban lang » ban hang, ban dang, ban lan
ba lang » va lang, ba bang, ba tang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van cam » van lam, van cau, van dam
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu ((van cam) OR (van nam)) quoc ((ban lang) OR (ba lang)) chai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xay hoi. hieu ((van cam) or (van nam)) quoc ((ban lang) OR (ba lang)) chai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu ((van cam) or (van nam)) quoc ((ban lang) OR (ba lang)) chai cua tre*.