Perhaps you should try some spelling variations:
thanh vinh » thanh binh, thanh tinh, than kinh
thanh dinh » thanh binh, thanh tinh, thanh kinh
thu sach » tu sach, thuat sach, thuoc sach
cuu tren » cu tren, cau tren, cuu tre
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, tao duoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x ho. hieu va ((cao duc) or (giao duc)) va ((thanh dinh) OR (thanh vinh)) cuu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x ho. hieu va ((cao duc) OR (giao duc)) va ((thanh dinh) OR (thanh vinh)) cuu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x ho. hieu va ((cao duc) or (giao duc)) va ((thanh dinh) OR (thanh vinh)) cuu tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x ho. hieu va ((cao duc) or (giao duc)) va ((thanh dinh) OR (thanh vinh)) cuu tren*.