Perhaps you should try some spelling variations:
lang phi » lang phu, lang chai, lang ha
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
phi cua » phai cua, chi cua, khi cua
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
vu sach » vu bach, vu khach
va cao » va cac, va co, va dao
ve cao » ve bao, ve cac, ve co

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 cao) or (va cao)) duc ban lang phi 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 cao) OR (va cao)) duc ban lang phi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky dang cay phoi. hieu ((ve cao) or (va cao)) duc ban lang phi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky dang cay phoi. hieu ((ve cao) or (va cao)) duc ban lang phi cua tre*.