Perhaps you should try some spelling variations:
viet cua » viec cua, viet ca, viet qua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ve cac ((duc van) or (duc anh)) anh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu ve cac ((duc van) OR (duc anh)) anh viet cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu ve cac ((duc van) or (duc anh)) anh viet cua tre*.