Perhaps you should try some spelling variations:
nang giao » nang cao
hieu nang » lieu nang, hieu lang, sieu nang
lang hai » lang chai, lang thai, lang ha
su sach » so sach, vu sach
ky tang » kho tang, ky trong, tay tang
ky dang » ky danh
va lang » va nang, hoa lang
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi

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 tang) OR (ky dang))) or (ky nang)) ha hoi. hieu nang giao duc va lang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((ky tang) OR (ky dang))) OR (ky nang)) ha hoi. hieu nang giao duc va lang hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((((ky tang) OR (ky dang))) or (ky nang)) ha hoi. hieu nang giao duc va lang hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((((ky tang) OR (ky dang))) or (ky nang)) ha hoi. hieu nang giao duc va lang hai cua tre*.