Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
van lien » van tien, van hien, va lien
lien cuc » dien cuc, lien tuc, vien cac
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cuc tre » duc tre, cua tre, cuu tre
co hoi » co hoc, co loi
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
o hoi » o hoc, o hai, 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: te sach ky nang ((o hoi) OR (co hoi)). hieu qua cham ((xuc va) or (luc va)) van lien cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((o hoi) OR (co hoi)). hieu qua cham ((xuc va) OR (luc va)) van lien cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((o hoi) OR (co hoi)). hieu qua cham ((xuc va) or (luc va)) van lien cuc tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((o hoi) OR (co hoi)). hieu qua cham ((xuc va) or (luc va)) van lien cuc tre*.