Perhaps you should try some spelling variations:
tuan danh » luan danh, tran danh, tuan dang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua
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: su sach ky nang x hoi. ((hieu ve) or (hieu va)) cham soc ((tuan danh) OR (tuan anh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. ((hieu ve) OR (hieu va)) cham soc ((tuan danh) OR (tuan anh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. ((hieu ve) or (hieu va)) cham soc ((tuan danh) OR (tuan anh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. ((hieu ve) or (hieu va)) cham soc ((tuan danh) OR (tuan anh)) di cua tre*.