Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
ban hanh » ban hang
hanh tai » thanh tai, hang tai, han tai
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao duc, cao suc
xuc ban » duc ban, cuc ban, quoc ban
tai cua » thai cua, tai cuc, tri cua
y nang » ky nang, ly nang, v nang
co hoi » co loi
va cao » va cac, va co, va dao
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y nang ((co hoi) OR (co hoc)). hieu va cao xuc ban hanh tai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach y nang ((co hoi) OR (co hoc)). hieu va cao xuc ban hanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: doc sach y nang ((co hoi) OR (co hoc)). hieu va cao xuc ban hanh tai cua te*.