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 cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
su sach » so sach
hieu va » lieu va, hieu qua
cuu ban » cuu van, cua ban, cuu san
cam cuu » cham cuu, cap cuu
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
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 cay phoi. ((hieu ve) or (hieu va)) cam cuu 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 cay phoi. ((hieu ve) OR (hieu va)) cam cuu ban lang chai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky dang cay phoi. ((hieu ve) or (hieu va)) cam cuu ban lang chai cua tre*.