Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
xuc ban » cuc ban, quoc ban, xuat ban
duc ban » duc tan, duc van, dua ban
tai cua » thai cua, tai cuc, dai cua
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 ((xuc ban) OR (duc ban)) thanh ((tai cua) or (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu ve cam ((xuc ban) OR (duc ban)) thanh ((tai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoi. hieu ve cam ((xuc ban) OR (duc ban)) thanh ((tai cua) or (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu ve cam ((xuc ban) OR (duc ban)) thanh ((tai cua) or (tri cua)) tre*.