Perhaps you should try some spelling variations:
lang chai » lang ha, lang cua, lang phi
chai cua » chat cua, thai cua, chi cua
ban lang » ban hang, ba lang, ban dang
dang xay » dang van, van xay
su sach » so sach
hieu va » lieu va, hieu qua
cuc ban » cua ban, cac ban, cuu ban
cam cuc » cam xuc, cham cuu, pham cuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
vu sach » vu bach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ky dang xay hoi. ((hieu ve) or (hieu va)) cam cuc ban lang chai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky dang xay hoi. ((hieu ve) OR (hieu va)) cam cuc ban lang chai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky dang xay hoi. ((hieu ve) or (hieu va)) cam cuc ban lang chai cua tre*.