Perhaps you should try some spelling variations:
khanh vinh » thanh vinh, khanh linh, thanh binh
hanh vinh » thanh vinh, hanh tinh, anh vinh
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao
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 cao) OR (va cao)) duc va ((hanh vinh) or (khanh vinh)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((ve cao) OR (va cao)) duc va ((hanh vinh) OR (khanh vinh)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((ve cao) OR (va cao)) duc va ((hanh vinh) or (khanh vinh)) cuu tre*".