Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
thien van » thi van
cac tren » ca tren, cau tren, rac tren
cham xuc » cam xuc, chat xuc, pham duc
sach ky » sac ky, sach y, sach ty
vai cac » va cac, tai cac, voi cac
tu sach » thu sach, su sach, te sach
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 ky nang ((o hoi) OR (o hai)). thien van ((cham xuc) or (cham soc)) van thanh vai cac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (o hai)). thien van ((cham xuc) OR (cham soc)) van thanh vai cac tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoi) OR (o hai)). thien van ((cham xuc) or (cham soc)) van thanh vai cac tren*".