Perhaps you should try some spelling variations:
lang chai » lang ha, lang cua, lang phi
dang xay » dang van, van xay
lanh hai » manh hai, thanh hai, lanh dao
su sach » so sach, vu sach
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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