Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
hai luc » hai cuc, khai luoc, nhan luc
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
su cac » su cao, su can, eu cac
va hai » van hai, va chai, va khai
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su cac) or (tu cac)) ky nang ma hoa. hieu va hai luc ((va hanh) OR (va danh)) va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cac) OR (tu cac)) ky nang ma hoa. hieu va hai luc ((va hanh) OR (va danh)) va cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su cac) or (tu cac)) ky nang ma hoa. hieu va hai luc ((va hanh) OR (va danh)) va cau tren".
• Adding a wildcard symbol may retrieve word variants: ((su cac) or (tu cac)) ky nang ma hoa. hieu va hai luc ((va hanh) OR (va danh)) va cau tren*.