Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cao suc » cao su, cao duc
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. hieu ve ((pham duc) or (cao suc)) van thanh tai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. hieu ve ((pham duc) OR (cao suc)) van thanh tai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu ve ((pham duc) or (cao suc)) van thanh tai ((cua te) or (cua tu))*.