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, va danh
hanh ve » hanh vi, hanh va, hanh kem
su cac » su can, eu cac, su cau
su cao » cu cao, vu cao, su co
va hai » van hai, va chai, va khai
luc va » duc va, tuc va, loc va
ve cau » ke cau, va cau, ve cac

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