Perhaps you should try some spelling variations:
hieu cac » hieu luc, hieu va, hieu van
hang tai » hang va, dung tai
ban hang » ngan hang
hien cac » thien cac, vien cac, dien cac
quoc ban » quoc bao, quoc lan, quoc quan
te sach » toc sach
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, cao hoc, tao hoi
co hoi » co hoc, co loi

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 ((cao hoi) or (co hoi)). bieu ((hien cac) OR (hieu cac)) quoc ban hang tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((cao hoi) OR (co hoi)). bieu ((hien cac) OR (hieu cac)) quoc ban hang tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((cao hoi) or (co hoi)). bieu ((hien cac) OR (hieu cac)) quoc ban hang tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((cao hoi) or (co hoi)). bieu ((hien cac) OR (hieu cac)) quoc ban hang tai cuu tre*.