Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
kha nang » phap nang, ky nang, ki nang
hang dai » hoang dai, hang tai, hang dau
ban hang » ngan hang
quoc ban » quoc bao, quoc lan, quoc quan
sach kha » sach nha, sach ha, sach tham
te sach » toc sach
ve cac » vien cac
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: te sach kha nang ((o hoi) OR (o hai)). hieu ((ve cac) or (va cac)) quoc ban hang dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach kha nang ((o hoi) OR (o hai)). hieu ((ve cac) OR (va cac)) quoc ban hang dai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach kha nang ((o hoi) OR (o hai)). hieu ((ve cac) or (va cac)) quoc ban hang dai cua triet*".