Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
ve triet » va trien, su triet
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cam duc » cam xuc, cao duc, nam duoc
sang ma » tang ma, nang ma, sang tao
vai ve » va ve, dai ve, vai 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 ((sang ma) or (nang x)) hoi. hieu ve ((cam duc) or (pham duc)) van thanh vai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((sang ma) OR (nang x)) hoi. hieu ve ((cam duc) OR (pham duc)) van thanh vai ve triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((sang ma) or (nang x)) hoi. hieu ve ((cam duc) or (pham duc)) van thanh vai ve triet*.