Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van minh
ban hanh » ban hang
chat huu » pham huu
huu viet » huy viet, hung viet, khau viet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va cam » va cham, va cac, va cao

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 ty nang ma hoa. hieu va cam luc ((((van hanh) OR (van ban))) or (ban hanh)) chat huu viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoa. hieu va cam luc ((((van hanh) OR (van ban))) OR (ban hanh)) chat huu viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoa. hieu va cam luc ((((van hanh) OR (van ban))) or (ban hanh)) chat huu viet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoa. hieu va cam luc ((((van hanh) OR (van ban))) or (ban hanh)) chat huu viet*.