Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
van dinh » van minh, van dich, va dinh
dinh dai » dinh dat, sinh dai, dinh dao
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
may hmi » may thoi
tay hoi » tay ho, tao hoi, tay thai
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang ((may hmi) or (tay hoi)). hieu vu cham duc van dinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ((may hmi) OR (tay hoi)). hieu vu cham duc van dinh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ((may hmi) or (tay hoi)). hieu vu cham duc van dinh dai cua tre*.