Perhaps you should try some spelling variations:
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
cua cau » cua cac, cua chu, cua cay
can cau » van cau, ban cau, cac cau
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
ca cau » cac cau, ca cac, co cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang cao hoi. hieu ve cac tuc va dan ((((ca cau) OR (cua cau))) or (can cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang cao hoi. hieu ve cac tuc va dan ((((ca cau) OR (cua cau))) OR (can cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang cao hoi. hieu ve cac tuc va dan ((((ca cau) OR (cua cau))) or (can cau)) tren".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang cao hoi. hieu ve cac tuc va dan ((((ca cau) OR (cua cau))) or (can cau)) tren*.