Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
hieu va » lieu va, hieu qua
vai cau » va cau, van cau, vai cac
dan vai » dan va, dan tai, dan vat
hieu ve » hieu van
cam luc » cam xuc, cau luc
va dan » ca dan, va dao, va dau
luc va » duc va, tuc va, loc va
su sac » su sach, su cac
su xac » pu xac, su 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 sac) OR (su xac)) ky nang mai khoi. ((hieu ve) or (hieu va)) cam luc va dan vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky nang mai khoi. ((hieu ve) OR (hieu va)) cam luc va dan vai cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su xac)) ky nang mai khoi. ((hieu ve) or (hieu va)) cam luc va dan vai cau tren*".