Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
van thanh » ban thanh, van tuan
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
phan cau » phan dau, phan cac, phan tu
cham xuc » cam xuc, chat xuc, pham duc
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
co hoi » co hoc, co loi
o hoi » o hoc, o hai, o hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (co hoi)). hieu van ((cham xuc) OR (cham soc)) van thanh phan cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoi) OR (co hoi)). hieu van ((cham xuc) or (cham soc)) van thanh phan cau tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) OR (co hoi)). hieu van ((cham xuc) or (cham soc)) van thanh phan cau tren*.