Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cau phuc » cau truc, chau phu, huu phuc
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
phuc va » phuc vu, thuc va, chuc va
ve cau » ke cau, va cau, ve cac
va dan » ca dan, va dao, va dau
va cai » va cac, va bai, va dai
va ca » va cac, va cao, va cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang cao hoi. hieu ve cau phuc va dan ((va ca) OR (va cai)) tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang cao hoi. hieu ve cau phuc va dan ((va ca) OR (va cai)) tren".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang cao hoi. hieu ve cau phuc va dan ((va ca) OR (va cai)) tren*.