Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
trinh cau » trinh chat, trinh chao, trinh tu
sinh cau » sinh vat, sinh va, sinh cua
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, tao duoc
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x ho. hieu va ((cao duc) or (giao duc)) van thanh ((sinh cau) OR (trinh cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x ho. hieu va ((cao duc) OR (giao duc)) van thanh ((sinh cau) OR (trinh cau)) tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x ho. hieu va ((cao duc) or (giao duc)) van thanh ((sinh cau) OR (trinh cau)) tren*".