Perhaps you should try some spelling variations:
sach ky » sac ky, sach y, sach ty
cac cau » cac mau, bac cau, cac cam
tu sach » thu sach, su sach, te sach
cao hoi » cau hoi, co hoi, cao hoc
ve cam » ve cham, va cam, ve cai
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
ca cau » cua cau, can cau, ca cac
ve cac » va cac, vien 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 (ve cac)) tuc va dan ((ca cau) OR (cac 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 (ve cac)) tuc va dan ((ca cau) OR (cac 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 (ve cac)) tuc va dan ((ca cau) OR (cac cau)) tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu ((ve cam) or (ve cac)) tuc va dan ((ca cau) OR (cac cau)) tren*.