Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va danh » va dinh, va hanh, dia danh
hai cua » thai cua, dai cua, hoi cua
va dan » ca dan, va dao, va dau
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu ve ((pham duc) or (cao duc)) ((va danh) OR (va dan)) hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ve ((pham duc) OR (cao duc)) ((va danh) OR (va dan)) hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ve ((pham duc) or (cao duc)) ((va danh) OR (va dan)) hai cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ve ((pham duc) or (cao duc)) ((va danh) OR (va dan)) hai cua te*.