Perhaps you should try some spelling variations:
vanh tai » van tai, hanh tai, anh tai
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
sach ty » sach y, sach tu, sach thu
va vanh » va van, va danh, va hanh
cao duc » dao duc, cao suc, giao duc
sach ky » sach y, sach kem, sach hay
va cao » va cac, va co, va dao
cua tu » cua tuc, cua su, cua cu
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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))) or (sac ky)) nang x hoi. hieu va cao duc va vanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((((sach ky) OR (sach ty))) OR (sac ky)) nang x hoi. hieu va cao duc va vanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: thu ((((sach ky) or (sach ty))) or (sac ky)) nang x hoi. hieu va cao duc va vanh tai cua tu*.