Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
tan thanh » tran thanh, tang thanh, toan thanh
cay phoi » cap phoi, cay cho, gap phoi
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
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: tu sach ky dang ((cay phoi) or (tay hoi)). hieu ((ve cam) or (ve cham)) duc tan thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ((cay phoi) OR (tay hoi)). hieu ((ve cam) OR (ve cham)) duc tan thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ((cay phoi) or (tay hoi)). hieu ((ve cam) or (ve cham)) duc tan thanh dai cua tre*.