Perhaps you should try some spelling variations:
hanh dinh » thanh dinh, hinh dinh, hanh tinh
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
dinh cu » dinh cuu, dinh chuc, dinh chau
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 ky) OR (sach ty)) nang x ho. hieu va ((tao duoc) or (giao duc)) va hanh dinh cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang x ho. hieu va ((tao duoc) OR (giao duc)) va hanh dinh cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang x ho. hieu va ((tao duoc) or (giao duc)) va hanh dinh cu tren".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang x ho. hieu va ((tao duoc) or (giao duc)) va hanh dinh cu tren*.