Perhaps you should try some spelling variations:
cay phoi » cap phoi, cay cho, gap phoi
lang phi » lang phu, lang chai, lang ha
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
phi cua » phai cua, chi cua, khi cua
ba lang » ban lang, va lang, ba bang
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
duc ba » duc ban, duc bao, duc va
ve cam » ve cac, va cam, ve cai

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 ky dang ((cay phoi) OR (tay hoi)). hieu ((ve cam) or (ve cham)) duc ba lang phi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang ((cay phoi) OR (tay hoi)). hieu ((ve cam) OR (ve cham)) duc ba lang phi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang ((cay phoi) OR (tay hoi)). hieu ((ve cam) or (ve cham)) duc ba lang phi cua tre*".