Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, thanh san
sach hoi » sach doi, sach moi, cach thoi
hoi nang » hoi lang, ho nang, hoa nang
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoi nang xa hoi. hieu ve ((pham duc) or (cao duc)) van ((thanh tai) OR (doanh tai)) cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi nang xa hoi. hieu ve ((pham duc) OR (cao duc)) van ((thanh tai) OR (doanh tai)) cuc te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoi nang xa hoi. hieu ve ((pham duc) or (cao duc)) van ((thanh tai) OR (doanh tai)) cuc te*".