Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
hang tai » hang va, dung tai
ban hang » ngan hang
cham cuc » cham cuu, pham cuc, pham chuc
tu sach » su sach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
cao hoi » cau hoi, co hoi, cao hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky nang cao hoi. ((hieu ve) OR (hieu van)) cham cuc ban hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang cao hoi. ((hieu ve) OR (hieu van)) cham cuc ban hang tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang cao hoi. ((hieu ve) OR (hieu van)) cham cuc ban hang tai cua tre*".