Perhaps you should try some spelling variations:
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, tao duoc
va hanh » van hanh, va thanh, va danh
tinh cu » tinh cua, tinh cau, dinh cu
cu tren » tu tren, dua tren

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