Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tri cua, dai cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, xuc ban
co hoi » co hoc, co loi
ve cac » va cac, vien cac
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 ve cac xuc van hanh ((thai cua) or (tai 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 ve cac xuc van hanh ((thai cua) OR (tai 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 ve cac xuc van hanh ((thai cua) or (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((o hoi) OR (co hoi)). hieu ve cac xuc van hanh ((thai cua) or (tai cuc)) tre*.