Perhaps you should try some spelling variations:
cao hoi » cau hoi, co hoi, cao hoc
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
can cau » van cau, ban cau, cac cau
tu sach » thu sach, su sach, te sach
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
ca cau » cua cau, cac cau, ca cac

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

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