Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
cam loc » cam lo
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
loc va » hoc va, luc va

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 van)) cam loc va thanh vai 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 van)) cam loc va thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. ((hieu ve) or (hieu van)) cam loc va thanh vai cua tre*.