Perhaps you should try some spelling variations:
tan dinh » tran dinh, van dinh, tai dinh
va trien » va truyen, va thiet, va tuyen
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach kem
cac duc » cac du, cac dac, cac nuoc
cao duc » dao duc, cao suc, giao duc
dinh cu » dinh cuu, dinh chuc, dinh chau
cu va » cuu va, tu va, su va

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) OR (sach ty)) nang xa hoi. hieu ve ((cac duc) or (cao duc)) tan dinh cu va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang xa hoi. hieu ve ((cac duc) OR (cao duc)) tan dinh cu va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang xa hoi. hieu ve ((cac duc) or (cao duc)) tan dinh cu va trien".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang xa hoi. hieu ve ((cac duc) or (cao duc)) tan dinh cu va trien*.