Perhaps you should try some spelling variations:
ban hang » ngan hang
cau tren » cu tren, dau tren, ca tren
hang tai » hang va, dung tai
sach ky » sac ky, sach y, sach ty
cuu tre » cau treo
tu sach » thu sach, su sach, te sach
cuc ban » cua ban, cac ban, cuu ban
cam cuc » cam xuc, cham cuu, pham cuc
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
cua tre » cua te, cua triet, dua tren
ve cam » ve cham, ve cac, va cam

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 ky nang cao hoi. hieu ve cam cuc ban hang tai ((((cuu tre) OR (cau tren))) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu ve cam cuc ban hang tai ((((cuu tre) OR (cau tren))) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoi. hieu ve cam cuc ban hang tai ((((cuu tre) OR (cau tren))) or (cua tre))*".